There are 13 Trophies that can be earned in this title.

Bronze

I have a friend
Complete a level in Co-op

Collector
Collect all 8 hidden comic books

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

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

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

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

Completionist
Level up any one character to level 50.

Silver

OCD
Destroy 1000 Crates

Bazooka Expert
Complete the game in Normal Difficulty

Slaughter Master
Kill 1000 enemies

Gold

Too Easy
Complete the game in Extreme Mode

2 Secret

http://www.ps3trophies.org/gam…../trophies/