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