Cheats are unlocked by completing Bounty Hunter challenges. They are then
available in the pause menu. The following Bounty levels unlock the corresponding
cheats.

Sad Stars: The Mine
No HUD: Stagecoach
Bite the Bullet (Enemies have golden guns): Fort Diego
No Distortion: End of the Line
Infinite Dead Eye: Battle Finale
Golden Gun: Siege
Invincibility: Fall From Grace