Kill 2000 enemies using melee attack or grabs
Kill 50 enemies in a single combo
Perform all grab moves, melee attacks and signature kills
Perform all 4 fully upgraded grab moves
Use each weapon in the game to kill an enemy
Complete the Campaign on Hardcore difficulty
Complete a mission on Hardcore without getting healed
Complete chapter 1
Complete the Campaign on Casual difficulty
Complete all Challenges
Take out the weapons train
Interrogate the sniper
Blow the factory gates!
Complete chapter 4
Complete chapter 3
Heal 50 times
Complete chapter 2
Play through an entire chapter with 4 player co-op
Upgrade all characters and signature weapons
Upgrade 1 character completely
Complete a challenge