Earn a gold medal on any level in single player Survival.
Frag a total of 100 players.
Earn a gold medal on any level in cooperative Survival.
Look Ma, I won!
Win a versus match.
Finish the Legend of the Beast campaign in single player or cooperative.
Complete the game in single player by beating the estimated time on each level.
Kill 10 enemies with the Chainsaw without releasing the trigger.
Complete the game.
Complete the Medieval episode in single player or cooperative.
Kill 200 enemies with the Laser gun.
The Perfect Storm
Complete the Persia episode in single player or cooperative.