Complete a battle in any game mode
Take down your opponent using melee
While in your screen, take down your opponent 100 times
Finish all single player missions
Finish survival mode
Collect all the memento cubes
Spend 9001 seconds in the opponent's screen
Take down 5 enemies with one single shotgun shot
Take down 5 enemies with one single rocket shot
Take down 3 enemies with one single rail shot
Take down your opponent 100 times while using Special Powers
Earn 20 stars in Story mode
Earn 30 stars in Story mode
Survive for more than 5 minutes in COOP