To get Laser sight ammo complete mission 4
To get Jetpack , complete mission 8
To get Fastwalk , Complete mission 13
Invisibility Complete mission 16
Low gravity Complete mission 20Banana->Super banana upgrade complete mission 33
Super sheep->Aqua sheep upgrade gold on Sheep Racing
Longbow upgrade Gold on Euthanasia Enhanced
Shotgun Gold on Rifle Range Enhanced
Grenades Gold on Artillery Range
Game Options
To get Blood, get Gold on basic training
To get Indestructible landscape, complete mission 25
To get Invincible worms, get Elite on Deathmatch
All crates are sheep, get gold on Crazy Crates
Miscellaneous
Completing all training missions with gold medals and achieving the Elite ranking on Deathmatch awards you an extra option scheme called "The Full Wormage". This gives you infinite supplies of all weapons (including the special ones), with maximum power for each, all the weapons cheats enabled, and the Blood game cheat enabled.