First commit for private source control. Older commits available on Github.

Assets/Scripts/Framework/Managers/Achievements/Data.meta

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+fileFormatVersion: 2
+guid: b4956f4efd45455b907a6183ed3d06f1
+timeCreated: 1773830079

Assets/Scripts/Framework/Managers/Achievements/Data/AchievementSO.cs

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+using BriarQueen.Data.Identifiers;
+using UnityEngine;
+
+namespace BriarQueen.Framework.Managers.Achievements.Data
+{
+    [CreateAssetMenu(fileName = "New Achievement", menuName = "Briar Queen/Achievements/New Achievement")]
+    public class AchievementSo : ScriptableObject
+    {
+        [Header("Achievement Details")]
+        public AchievementID Achievement;
+
+        public string Name;
+        public string Description;
+
+        [Header("Steam Integration")]
+        public string SteamUniqueIdentifier;
+    }
+}

Assets/Scripts/Framework/Managers/Achievements/Data/AchievementSO.cs.meta

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+fileFormatVersion: 2
+guid: ef4d39885de444d9840717db9173c5b5
+timeCreated: 1772721525

Assets/Scripts/Framework/Managers/Achievements/Steam.meta

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+fileFormatVersion: 2
+guid: 9f220a47c48b444abc68a41e0aa5cf9f
+timeCreated: 1772728857

Assets/Scripts/Framework/Managers/Achievements/Steam/SteamManager.cs

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+using System;
+using System.Linq;
+using BriarQueen.Framework.Coordinators.Events;
+using BriarQueen.Framework.Events.Progression;
+using BriarQueen.Framework.Registries;
+using Steamworks;
+using UnityEngine;
+using VContainer;
+
+namespace BriarQueen.Framework.Managers.Achievements.Steam
+{
+    public class SteamManager : IDisposable, IManager
+    {
+        private const uint STEAM_APP_ID = 0;
+        private readonly AchievementRegistry _achievementRegistry;
+
+        private readonly EventCoordinator _eventCoordinator;
+
+        public bool Initialized { get; private set; }
+
+        [Inject]
+        public SteamManager(EventCoordinator eventCoordinator, AchievementRegistry achievementRegistry)
+        {
+            _eventCoordinator = eventCoordinator;
+            _achievementRegistry = achievementRegistry;
+        }
+
+
+        public void Dispose()
+        {
+            _eventCoordinator.Unsubscribe<UnlockAchievementEvent>(OnUnlockAchievement);
+        }
+
+        public void Initialize()
+        {
+            try
+            {
+                SteamClient.Init(STEAM_APP_ID);
+                Initialized = true;
+            }
+            catch (Exception e)
+            {
+                Debug.Log($"[Steam Manager] Steam Failed to Init {e.Message}");
+                return;
+            }
+
+            _eventCoordinator.Subscribe<UnlockAchievementEvent>(OnUnlockAchievement);
+        }
+
+        private void OnUnlockAchievement(UnlockAchievementEvent evt)
+        {
+            if (!_achievementRegistry.TryGetAchievement(evt.AchievementID, out var achievement))
+                return;
+
+            var steamAch =
+                SteamUserStats.Achievements.FirstOrDefault(x => x.Identifier == achievement.SteamUniqueIdentifier);
+
+            if (string.IsNullOrEmpty(steamAch.Identifier))
+            {
+                Debug.LogWarning($"Steam achievement '{evt.AchievementID}' not found in Steamworks.");
+                return;
+            }
+
+            if (steamAch.State) return;
+
+            steamAch.Trigger();
+        }
+    }
+}

Assets/Scripts/Framework/Managers/Achievements/Steam/SteamManager.cs.meta

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+fileFormatVersion: 2
+guid: 91a1d462420f49cb8cb6428d41848983
+timeCreated: 1772728857