To enable the following codes, you must accomplish the given goal. To activate codes, go to the Weapons or Game options screen.

Laser sight: 			Complete mission 4 
Jetpack: 			Complete mission 8 
Fast walk: 			Complete mission 13 
Invisibility: 			Complete mission 16 (only works in net games)
Low gravity: 			Complete mission 20 
Indestructible landscape:  	Complete mission 25 
Super Banana Bomb upgrade: 	Complete mission 33 
Aqua Sheep upgrade: 		Get Gold on Super Sheep Racing Training 
Longbow upgrade: 		Get Gold on Euthanasia Training 
Shotgun upgrade: 		Get Gold on Rifle Range Training 
Grenade upgrade: 		Get Gold on Artillery Training
Worms bleed when shot:		Get Gold in Basic Training 
All crates have sheep:		Get Gold in Crazy Crates Training  
Invincibility:			Earn an Elite rank in Deathmatch mode 
Full Wormage game options: 	Earn a Gold medal and Elite ranking in all modes

Thanks to Revolution readers The Gremlin, Lauras, and Joseph A.v.briggs!