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