add achievements field to user model

services/backend/api/v1/achievement/views.py

@@ -0,0 +1,20 @@
+from http import HTTPStatus as status
+
+from ninja import Router
+
+from apps.achievement.models import Achievement
+from api.v1.achievement.schemas import AchievementSchema
+from api.v1.schemas import UnauthorizedError
+
+router = Router()
+
+
+@router.get(
+    "",
+    response={
+        status.OK: list[AchievementSchema],
+        status.UNAUTHORIZED: UnauthorizedError,
+    }
+)
+def get_all_achievements(request):
+    return Achievement.objects.all()