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