Successfully complete the game under the easy difficulty setting to unlock Gallery 1 and the Cabal guns.

Successfully complete the game under the normal difficulty setting to unlock the .50 Desert Eagle and the hard difficulty setting.

Successfully complete the game under the hard difficulty setting to unlock the Molotov cocktail and the expert difficulty setting.

Successfully complete the game under the expert difficulty setting to unlock the rocket launcher.

Successfully complete instant action mode under the easy difficulty setting to unlock the Cabal SMG.

Successfully complete instant action mode under the normal difficulty setting to unlock extra adrenaline.

Successfully complete instant action mode under the hard difficulty setting to unlock extra health.