I'd like items you can get only from achievement, like maybe giant burger for burger achievement or exclusive posters for hunting arials on the map, you can claim and put in inventory. Points are whatever, if you know what you are doing.
items you can only get from achievements would be a great idea; unique items you can claim for doing certain achievements. Maybe you could even claim a few event exclusive items from achievements? (e.g. gravity gun from an achievement idea i have where you make peace with the arirals)
