Extreme difficulty mode: 
Beat the game on normal or hard difficulty. 

Gallery: 
Beat the game on any difficulty. 

Music: 
Player Beat the game on any difficulty. 

Trailer:
Beat the game on any difficulty.

Faster Reload:
Immediately after pressing L to reload, press L3 to block. When L3 is released, your weapon will be instantly reloaded.

Spread Finger Gesture: 
Hold Block then press White, Black.