Complete the following tasks to unlock the various rewards.

Unlockable	How to unlock
Brass Knuckles	Beat the game on Nightmare or Higher.
Classic Mode	Beat the game on Nightmare.
Classic Outfit	Find all three anima encounters and finish the game.
Drifter Outfit	Finish the game.
Infinite Ammo	Complete Classic Mode.
Magnum	Finish the game.
Professional	Finish the game.