When posting an achievement with a user message it gives the following error:
{"error":{"message":"(#100) You haven't enabled User Messages for this action type (127701393971353) yet. Please update your Open Graph settings in the App Dashboard","type":"OAuthException","code":100}}
No clue where to enable that.
Managed to get access to the setting by modifying the url manually with the id. https://developers.facebook.com/apps/your_app_id_here/opengraph/action_type/127701393971353/