Complete any level in co-op.
Kill 10 enemies with the Chainsaw without releasing the trigger.
Frag a total of 100 players.
Win a versus match.
Complete the game in single player on unmodified serious difficulty.
Kill 20 Harpies with the Sniper rifle.
Burn 100 enemies to death.
Earn a gold medal on any level in cooperative Survival.
Kill 100 Kleers with the Cannon.
Find at least 10 secrets in single player.
Kill at least 30 enemies with a single Serious Bomb.
Complete the Medieval episode in single player or cooperative.
Destroy an enemy cannon with your own cannon.
Complete the Persia episode in single player or cooperative.
Complete any level in single player.
Kill 100 enemies with Serious Damage active.
Complete the game in single player by beating the estimated time on each level.
Complete the game.
Complete the South America episode in single player or cooperative.
Kill 200 enemies with the Laser gun.
Earn a gold medal on any level in single player Survival.
Finish the Legend of the Beast campaign in single player or cooperative.
Find a secret under water.
Kill 50 Cucurbitos.
Kill 20 enemies with the Minigun without releasing the trigger.
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