All Levels + Unlimited Ammo + Invincibility:
Hold L2 + R2, press Left, Down, Right, Up.
on the title screen.

Cheat menu codes:
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CLAW Egypt fodder - 2p. 
GODDESS Female Trooper - 2p. 
GODLY God mode. 
UGLY Hive Fodder - 2p. 
LEGGY Hive Guard - 2p. 
SORTED Infinite ammo. 
SKIPPY Level select. 
COLDENPIE Unlock all cheats. 
LOADED Unlock all weapons. 
RUBBER Volcano Guard - 2p.