From The Official Visionaire Studio: Adventure Game Engine Wiki
Available since: v3.6
Sets the specified steam stat to the given value. Note: this command only works if the steam_api library was loaded and if a steam account for your game exists.
- "string" - The name of the stat to set. This is the API name specified in the steam account.
- int - Stat will be set to this value.
- True if the value was set successfully, false if the operation failed.