diff --git a/SVSim.EmulatedEntrypoint/Controllers/AchievementController.cs b/SVSim.EmulatedEntrypoint/Controllers/AchievementController.cs
new file mode 100644
index 0000000..857b4c9
--- /dev/null
+++ b/SVSim.EmulatedEntrypoint/Controllers/AchievementController.cs
@@ -0,0 +1,133 @@
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using SVSim.Database;
+using SVSim.Database.Enums;
+using SVSim.Database.Models;
+using SVSim.Database.Repositories.Mission;
+using SVSim.Database.Services;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Achievement;
+using SVSim.EmulatedEntrypoint.Services;
+
+namespace SVSim.EmulatedEntrypoint.Controllers;
+
+/// <summary>
+/// /achievement/* — claim achievement rewards. Wire shape mirrors AchievementReceiveRewardTask.cs.
+/// </summary>
+[Route("achievement")]
+public class AchievementController : SVSimController
+{
+    private const int FailureResultCode = 2;
+
+    private readonly SVSimDbContext _db;
+    private readonly IMissionCatalogRepository _catalog;
+    private readonly IViewerMissionStateService _state;
+    private readonly IMissionAssembler _assembler;
+    private readonly RewardGrantService _grantService;
+
+    public AchievementController(
+        SVSimDbContext db,
+        IMissionCatalogRepository catalog,
+        IViewerMissionStateService state,
+        IMissionAssembler assembler,
+        RewardGrantService grantService)
+    {
+        _db = db;
+        _catalog = catalog;
+        _state = state;
+        _assembler = assembler;
+        _grantService = grantService;
+    }
+
+    [HttpPost("receive_reward")]
+    public async Task<IActionResult> ReceiveReward(
+        AchievementReceiveRewardRequest request, CancellationToken ct)
+    {
+        if (!TryGetViewerId(out long viewerId)) return Unauthorized();
+
+        // Load viewer with all the collections RewardGrantService may need to mutate.
+        var viewer = await _db.Viewers
+            .Include(v => v.MissionData)
+            .Include(v => v.Currency)
+            .Include(v => v.Cards)
+            .Include(v => v.Items)
+            .Include(v => v.Sleeves)
+            .Include(v => v.Emblems)
+            .Include(v => v.Degrees)
+            .Include(v => v.LeaderSkins)
+            .Include(v => v.MyPageBackgrounds)
+            .AsSplitQuery()
+            .FirstAsync(v => v.Id == viewerId, ct);
+
+        await _state.EnsureCurrentAsync(viewer, ct);
+        await _db.SaveChangesAsync(ct);
+
+        // Re-read viewer's achievement for this type after state-service materialization.
+        var ach = await _db.ViewerAchievements
+            .FirstOrDefaultAsync(a => a.ViewerId == viewerId && a.AchievementType == request.AchievementType, ct);
+        if (ach is null || ach.Level != request.Level)
+        {
+            return Ok(new { result_code = FailureResultCode });
+        }
+
+        var catalogRow = await _catalog.GetAchievementAsync(request.AchievementType, request.Level, ct);
+        if (catalogRow is null)
+        {
+            return Ok(new { result_code = FailureResultCode });
+        }
+
+        // Grant via the canonical RewardGrantService primitive.
+        var granted = await _grantService.ApplyAsync(
+            viewer,
+            (UserGoodsType)catalogRow.RewardType,
+            catalogRow.RewardDetailId,
+            catalogRow.RewardNumber,
+            ct);
+
+        // Advance viewer's level by 1. If no catalog row exists at the new level (i.e. just
+        // claimed the highest captured tier), max_level on the wire stays the same and the
+        // UI shows "claimed at max" until catalog grows.
+        ach.Level += 1;
+        var maxLevelByType = await _catalog.GetMaxLevelByAchievementTypeAsync(ct);
+        if (maxLevelByType.TryGetValue(request.AchievementType, out int maxLevel)
+            && ach.Level > maxLevel)
+        {
+            ach.AchievementStatus = 2;
+        }
+        else
+        {
+            ach.AchievementStatus = 0;
+        }
+        ach.NowAchievedLevel = request.Level;
+
+        await _db.SaveChangesAsync(ct);
+
+        var dto = await _assembler.BuildAsync(viewer, ct);
+        var resp = new AchievementReceiveRewardResponse
+        {
+            UserMissionList = dto.UserMissionList,
+            UserAchievementList = dto.UserAchievementList,
+            BattlePassMonthlyMission = dto.BattlePassMonthlyMission,
+            IsChangeMission = dto.IsChangeMission,
+            CanChangeMissionTime = dto.CanChangeMissionTime,
+            IsChangeReceiveType = dto.IsChangeReceiveType,
+            CanChangeReceiveTypeTime = dto.CanChangeReceiveTypeTime,
+            MissionReceiveType = dto.MissionReceiveType,
+            RewardList = granted.Select(g => new RewardGrantDto
+            {
+                RewardType = g.RewardType,
+                RewardId = g.RewardId,
+                RewardNum = g.RewardNum,
+            }).ToList(),
+            TotalReceiveCountList = granted.Select(g => new TotalReceiveCountDto
+            {
+                RewardType = g.RewardType,
+                RewardDetailId = g.RewardId,
+                RewardCount = g.RewardNum,
+                ItemType = 0,
+                IsUsable = true,
+            }).ToList(),
+        };
+
+        return Ok(resp);
+    }
+}
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Achievement/AchievementReceiveRewardRequest.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Achievement/AchievementReceiveRewardRequest.cs
new file mode 100644
index 0000000..d83035b
--- /dev/null
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Achievement/AchievementReceiveRewardRequest.cs
@@ -0,0 +1,17 @@
+using System.Text.Json.Serialization;
+using MessagePack;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Achievement;
+
+[MessagePackObject]
+public class AchievementReceiveRewardRequest : BaseRequest
+{
+    [Key("achievement_type")]
+    [JsonPropertyName("achievement_type")]
+    public int AchievementType { get; set; }
+
+    [Key("level")]
+    [JsonPropertyName("level")]
+    public int Level { get; set; }
+}
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Achievement/AchievementReceiveRewardResponse.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Achievement/AchievementReceiveRewardResponse.cs
new file mode 100644
index 0000000..2c6e79f
--- /dev/null
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Achievement/AchievementReceiveRewardResponse.cs
@@ -0,0 +1,33 @@
+using System.Text.Json.Serialization;
+using MessagePack;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Common.Mission;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Achievement;
+
+[MessagePackObject(keyAsPropertyName: true)]
+public class TotalReceiveCountDto
+{
+    [Key(0)][JsonPropertyName("reward_type")] public int RewardType { get; set; }
+    [Key(1)][JsonPropertyName("reward_detail_id")] public long RewardDetailId { get; set; }
+    [Key(2)][JsonPropertyName("reward_count")] public int RewardCount { get; set; }
+    [Key(3)][JsonPropertyName("item_type")] public int ItemType { get; set; }
+    [Key(4)][JsonPropertyName("is_usable")] public bool IsUsable { get; set; } = true;
+}
+
+[MessagePackObject(keyAsPropertyName: true)]
+public class RewardGrantDto
+{
+    [Key(0)][JsonPropertyName("reward_type")] public int RewardType { get; set; }
+    [Key(1)][JsonPropertyName("reward_id")] public long RewardId { get; set; }
+    [Key(2)][JsonPropertyName("reward_num")] public int RewardNum { get; set; }
+}
+
+/// <summary>
+/// /achievement/receive_reward response — MissionInfoDataDto + two extras consumed by
+/// PlayerStaticData.UpdateHaveUserGoodsNumByJsonData per AchievementReceiveRewardTask.cs:33.
+/// </summary>
+public sealed class AchievementReceiveRewardResponse : MissionInfoDataDto
+{
+    [JsonPropertyName("total_receive_count_list")] public List<TotalReceiveCountDto> TotalReceiveCountList { get; set; } = new();
+    [JsonPropertyName("reward_list")] public List<RewardGrantDto> RewardList { get; set; } = new();
+}
diff --git a/SVSim.UnitTests/Controllers/AchievementControllerTests.cs b/SVSim.UnitTests/Controllers/AchievementControllerTests.cs
new file mode 100644
index 0000000..d86086f
--- /dev/null
+++ b/SVSim.UnitTests/Controllers/AchievementControllerTests.cs
@@ -0,0 +1,128 @@
+using System.Net;
+using System.Net.Http.Json;
+using System.Text;
+using System.Text.Json;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using SVSim.Bootstrap.Importers;
+using SVSim.Database;
+using SVSim.UnitTests.Infrastructure;
+
+namespace SVSim.UnitTests.Controllers;
+
+public class AchievementControllerTests
+{
+    private static string SeedDir => Path.Combine(AppContext.BaseDirectory, "Data", "seeds");
+    private static StringContent JsonBody(string json) => new(json, Encoding.UTF8, "application/json");
+
+    private static async Task ImportCatalogs(SVSimTestFactory f)
+    {
+        using var scope = f.Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+        await new MissionCatalogImporter().ImportAsync(db, SeedDir);
+        await new AchievementCatalogImporter().ImportAsync(db, SeedDir);
+        await new BattlePassMonthlyMissionImporter().ImportAsync(db, SeedDir);
+    }
+
+    private static async Task<ulong> RupeesBalance(SVSimTestFactory f, long viewerId)
+    {
+        await using var scope = f.Services.CreateAsyncScope();
+        var db = scope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+        var v = await db.Viewers.Include(x => x.Currency).FirstAsync(x => x.Id == viewerId);
+        return v.Currency.Rupees;
+    }
+
+    [Test]
+    public async Task Claim_advances_level_by_one()
+    {
+        using var factory = new SVSimTestFactory();
+        long viewerId = await factory.SeedViewerAsync();
+        await ImportCatalogs(factory);
+
+        using var client = factory.CreateAuthenticatedClient(viewerId);
+        // Materialize achievements at MIN(Level) per type
+        await client.PostAsync("/mission/info", JsonBody("""{"viewer_id":"0","steam_id":0,"steam_session_ticket":""}"""));
+
+        // Find an achievement that the viewer is at and claim it.
+        // Type 50 ("Achieve Beginner 3 rank") has captured tier at level 3 only — viewer starts at 3.
+        var claimBody = """{"achievement_type":50,"level":3,"viewer_id":"0","steam_id":0,"steam_session_ticket":""}""";
+        var resp = await client.PostAsync("/achievement/receive_reward", JsonBody(claimBody));
+        var body = await resp.Content.ReadAsStringAsync();
+        Assert.That(resp.StatusCode, Is.EqualTo(HttpStatusCode.OK), body);
+
+        await using var scope = factory.Services.CreateAsyncScope();
+        var db = scope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+        var refreshed = await db.ViewerAchievements
+            .FirstAsync(a => a.ViewerId == viewerId && a.AchievementType == 50);
+        Assert.That(refreshed.Level, Is.EqualTo(4));
+    }
+
+    [Test]
+    public async Task Claim_grants_rupees_via_RewardGrantService()
+    {
+        using var factory = new SVSimTestFactory();
+        long viewerId = await factory.SeedViewerAsync();
+        await ImportCatalogs(factory);
+
+        using var client = factory.CreateAuthenticatedClient(viewerId);
+        await client.PostAsync("/mission/info", JsonBody("""{"viewer_id":"0","steam_id":0,"steam_session_ticket":""}"""));
+
+        ulong rupeesBefore = await RupeesBalance(factory, viewerId);
+
+        // Type 50 reward in capture: reward_type=9 (Rupy in UserGoodsType enum), reward_number=100.
+        var claimBody = """{"achievement_type":50,"level":3,"viewer_id":"0","steam_id":0,"steam_session_ticket":""}""";
+        var resp = await client.PostAsync("/achievement/receive_reward", JsonBody(claimBody));
+        resp.EnsureSuccessStatusCode();
+
+        ulong rupeesAfter = await RupeesBalance(factory, viewerId);
+        Assert.That(rupeesAfter, Is.EqualTo(rupeesBefore + 100UL),
+            "claiming type 50 / level 3 should grant 100 rupees");
+    }
+
+    [Test]
+    public async Task Claim_response_contains_reward_list()
+    {
+        using var factory = new SVSimTestFactory();
+        long viewerId = await factory.SeedViewerAsync();
+        await ImportCatalogs(factory);
+
+        using var client = factory.CreateAuthenticatedClient(viewerId);
+        await client.PostAsync("/mission/info", JsonBody("""{"viewer_id":"0","steam_id":0,"steam_session_ticket":""}"""));
+
+        var claimBody = """{"achievement_type":50,"level":3,"viewer_id":"0","steam_id":0,"steam_session_ticket":""}""";
+        var resp = await client.PostAsync("/achievement/receive_reward", JsonBody(claimBody));
+        resp.EnsureSuccessStatusCode();
+        var body = await resp.Content.ReadAsStringAsync();
+
+        using var doc = JsonDocument.Parse(body);
+        var rewardList = doc.RootElement.GetProperty("reward_list");
+        Assert.That(rewardList.GetArrayLength(), Is.GreaterThanOrEqualTo(1));
+        var grant = rewardList[0];
+        Assert.That(grant.GetProperty("reward_type").GetInt32(), Is.EqualTo(9));
+        // For currency grants, reward_num is the POST-STATE TOTAL (per project convention,
+        // matches /pack/open behavior). Default-seeded viewer has 50000 rupees → 50100 after grant.
+        Assert.That(grant.GetProperty("reward_num").GetInt32(), Is.GreaterThanOrEqualTo(100),
+            "reward_num is post-state total for currencies, must be at least the granted amount");
+    }
+
+    [Test]
+    public async Task Subsequent_claim_of_same_level_fails()
+    {
+        using var factory = new SVSimTestFactory();
+        long viewerId = await factory.SeedViewerAsync();
+        await ImportCatalogs(factory);
+
+        using var client = factory.CreateAuthenticatedClient(viewerId);
+        await client.PostAsync("/mission/info", JsonBody("""{"viewer_id":"0","steam_id":0,"steam_session_ticket":""}"""));
+
+        var claimBody = """{"achievement_type":50,"level":3,"viewer_id":"0","steam_id":0,"steam_session_ticket":""}""";
+
+        var first = await client.PostAsync("/achievement/receive_reward", JsonBody(claimBody));
+        first.EnsureSuccessStatusCode();
+
+        var second = await client.PostAsync("/achievement/receive_reward", JsonBody(claimBody));
+        var body = await second.Content.ReadAsStringAsync();
+        Assert.That(body, Does.Contain("\"result_code\":2"),
+            "second claim at the same level must fail with result_code=2");
+    }
+}