Successfully complete the single player campaign. Then, press Up(2), Down(2), Left, Right, Left, Right, Circle, X, Start at the title screen. More costumes will now be accessible at the "Unlocks" menu.
Successfully complete Story mode. Pause game play in any level, then press Up, Square, Down, Circle, Left, Triangle, Right, X at the "View Unlocks" screen.
Complete the indicated task to unlock the corresponding costumes.
- Dance: Complete the single player campaign under the Normal difficulty.
- Gimp: Kill 500 creatures.
- Horror: Kill 100 enemies with a chainsaw.
- Mow 'em Down: Get 1,000 total kills.
- Red Pajamas: Perform a 150-hit combo
- Spartan: Complete the backstory.
- White Pajamas: Perform a 100-hit combo.
- Wildman: Complete the single player campaign under the Hard difficulty.
- Yellow Jump Suit: Kill 100 enemies.
Complete the indicated task to unlock the corresponding concept art.
- Concept Art #1: Get 100 shank kills.
- Concept Art #2: Get 100 kills with the chains.
- Concept Art #3: Get 100 kills with dual pistols.
- Concept Art #4: Get 100 kills with the katana.
- Concept Art #5: Get 100 kills with grenades.
- Concept Art #6: Get 100 kills with the Uzi.
Use the handguns to shoot off the screen to kill enemies that are active, but not visible yet. Note: This does not always work.
Complete the following tasks to unlock PlayStation3 trophy rewards.
- The Wrong Guy (Bronze): Defeat El Raton.
- The Meating (Bronze): Defeat The Butcher.
- Scars from the past (Bronze): Defeat Cassandra.
- Revenge is Sweet (Bronze): Defeat Cesar.
- Just getting started (Bronze): Take out 20 enemies.
- Making a name for yourself (Bronze): Take out 100 enemies.
- Grindhouse (Bronze): 100 Chainsw kills.
- And it continues (Silver): Complete Single Player Campaign on Normal Mode.
- Backstory (Silver): Complete Co-op Campaign Mode.
- Father forgive me... (Silver): Defeat The Priest.
- Mow 'em Down (Silver): Take out 1000 enemies.
- I'm just that good (Gold): Complete Single Player Campaign on Hard Mode.