diff --git a/aiosu/models/common.py b/aiosu/models/common.py
index c911823..5895e7a 100644
--- a/aiosu/models/common.py
+++ b/aiosu/models/common.py
@@ -46,11 +46,11 @@ class Achievement(BaseModel):
     id: int
     name: str
     slug: str
-    desciption: str
+    description: str
     grouping: str
     icon_url: str
-    mode: Gamemode
     ordering: int
+    mode: Optional[Gamemode] = None
     instructions: Optional[str] = None
 
 
diff --git a/aiosu/models/event.py b/aiosu/models/event.py
index 3a6b96f..54b9b5e 100644
--- a/aiosu/models/event.py
+++ b/aiosu/models/event.py
@@ -65,7 +65,7 @@ class Event(BaseModel):
     type: EventType
     r"""Information on types: https://github.com/ppy/osu-web/blob/master/resources/assets/lib/interfaces/event-json.ts"""
     parse_error: Optional[bool] = None
-    achievment: Optional[Achievement] = None
+    achievement: Optional[Achievement] = None
     user: Optional[EventUser] = None
     beatmap: Optional[EventBeatmap] = None
     beatmapset: Optional[EventBeatmapset] = None