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