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