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Too Easy
Complete the game in Extreme Mode

Bazooka Expert
Complete the game in Normal Difficulty

Destroy 1000 Crates

Slaughter Master
Kill 1000 enemies

Big Daddy Expert
With Big Daddy, use the flashbang to stun 6 enemies at once.

Collect all 8 hidden comic books

Level up any one character to level 50.

Hit Girl Expert
With Hit Girl, Kill 2 enemies in one wall run attack.

I have a friend
Complete a level in Co-op

I'm not Invisible
Set off the security camera 5 times in one level.

Jerry Lee
Light a Piano on fire in the Penthouse

Junkyard King
Find and kill the Junkyard King

Kick-Ass Expert
With Kick-Ass, Kill 10 enemies during one rage activation.