Rogue Trooper
Unlock Extreme ragdoll:
Beat the game once
Unlock Low gravity ragdoll:
Beat the game once
Unlock Hippy Blood:
Beat the game once
Unlock Level Select:
Clear one level and you can select it from the cheat menu
Unlock Massacre Difficulty:
Beat the game once on any difficulty
All weapons and upgrades:
Successfully complete the game. Instead of starting a new game,
use the “Level select” cheat and start on the first level to keep
all your weapons and upgrades from the previous game.