Get a letter grade in all eight finales in any mode.
Collect 10 Golden Hats.
Collect all the prisoners of one head shape.
Complete the first four finales in any mode.
Collect all the weapons in the Gift Shop by unlocking or trading.
Use each weapon successfully.
Get an A++ in 10 levels.
Complete the story's opening sequence in any mode.
Be on the winning team in 100 arena matches.
Be on the winning team in one arena match of every mode.
Free 50 prisoners in the Gift Shop.
Die enough times and we give you a prize.
Successfully use every melee attack move.
Find a secret level.
Get 100 kills.
Trade online with ten different players.
Play and rate 10 user-created levels.
Get eaten alive.
Download and host a game of user-created levels.
Play with the Behemoth or someone with this achievement in an online game.
Kill your teammate 50 times.
Get yourself a cool new weapon.
Make a trade with someone.
Free a fellow prisoner.
Get a letter grade in every level (except Encores) in Normal Solo Story Mode.
Get a letter grade in every level (except Encores) in Normal Co-op Story Mode.
Get a letter grade in every level (except Encores) in insane solo story mode.
Get a letter grade in every level (except Encores) in insane co-op story mode.
Complete all the Encores in any mode.
Free all the prisoners in the Gift Shop by unlocking or trading.
