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