Here is the full list of all 30 BattleBlock Theater achievements.
Free all the prisoners in the Gift Shop by unlocking or trading.
Be on the winning team in 100 arena matches.
Download and host a game of user-created levels.
Be on the winning team in one arena match of every mode.
Kill your teammate 50 times.
Get a letter grade in every level (except Encores) in insane co-op story mode.
Complete all the Encores in any mode.
Get a letter grade in every level (except Encores) in insane solo story mode.
Use each weapon successfully.
Successfully use every melee attack move.
Complete 10 user-created levels in a single Featured Story playlist.
Get a letter grade in every level (except Encores) in Normal Co-op Story Mode.
Play with the Behemoth or someone with this achievement in an online game.
Collect 10 Golden Hats.
Collect all the prisoners of one head shape.
Get 100 kills.
Make a trade with someone.
Get a letter grade in every level (except Encores) in Normal Solo Story Mode.
Get a letter grade in all eight finales in any mode.
Free 50 prisoners in the Gift Shop.
Collect all the weapons in the Gift Shop by unlocking or trading.
Die enough times and we give you a prize.
Complete the first four finales in any mode.
Free a fellow prisoner.
Get yourself a cool new weapon.
Get eaten alive.
Find a secret level.
Complete an encore level in Story Mode.
Get an A++ in 10 levels.
Complete the story's opening sequence in any mode.