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