Complete any level in single player.
Complete a level in co-op with blood option set to hippy.
Frag a total of 100 players.
Win a versus match.
Complete any level in co-op.
Kill 20 enemies with the Minigun without releasing the trigger.
Pierce at least 10 enemies with a single cannonball.
Find at least 10 secrets in single player.
Leap into the unknown on Luxor.
Kill 100 Enemies with the Cannon.
Kill 150 Enemies with the Rocket Launcher.
Kill 200 Enemies with the Thompson Submachine gun.
Kill 250 Enemies with a shotgun.
Kill 300 Enemies with the Minigun.
Complete the game.
Complete the game in single player by beating the estimated time on each level.
Complete the Metropolis level in single player on unmodified serious difficulty.
Complete the game in single player on unmodified serious difficulty.
Complete the game in co-op on unmodified serious difficulty.
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