Complete "The Birth" on any difficulty.

Complete "Lunar Apocalypse" on any difficulty.

Carry all weapons with ammo at once.

Use a cheat code.

Find a secret area.

Beat The Doctor Who Cloned Me on Normal Difficulty

Kill 30 enemies with the moon rover

Earn a 1,000,000 pinball score on the Scientits pinball machine

Kill 3 enemies within 3 seconds with the Impregnader

Let 20 enemies die by someone else's hand

Complete the SP campaign on Hard Difficulty

Watch the credits all the way through