Reward for Unlocking 100% Achievements (Completionist Cape / Outfit)

Minecraft currently gives Character Creator items for specific achievements, but there is no final reward for players who go the extra mile to unlock 100% of all achievements. ​Adding a unique "100% Completionist" cape or a cosmetic item with a "%100" logo/design would give players a great goal to strive for. It would be an amazing badge of honor to show off in multiplayer servers and Realms to prove that you've mastered every part of the game!