Here is the full list of all 30 BattleBlock Theater achievements.
Successfully use every melee attack move.
Be on the winning team in one arena match of every mode.
Get a letter grade in every level (except Encores) in Normal Solo Story Mode.
Kill your teammate 50 times.
Collect all the prisoners of one head shape.
Collect 10 Golden Hats.
Get 100 kills.
Get a letter grade in all eight finales in any mode.
Collect all the weapons in the Gift Shop by unlocking or trading.
Free 50 prisoners in the Gift Shop.
Make a trade with someone.
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.
Download and host a game of user-created 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.
Find a secret level.
Free a fellow prisoner.
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.
Be on the winning team in 100 arena matches.
Free all the prisoners in the Gift Shop by unlocking or trading.
Use each weapon successfully.