ANY-S Costume for Shank
    Beat the game on any difficulty, then enter any level and enter the Konami Code at the 'View

Unlocks' screen.
  ANY-S Shank: Press Up, Up, Down, Down, Left, Right, Left, Right, B, A, at the View Unlocks Screen    after beating the game

Achievements
    Just That Good (25): Complete the single player campaign on Hard mode.
    Revenge is Sweet (20): Defeat Cesar.
    The Wrong Guy (10): Defeat El Raton
    Scars From the Past (15): Defeat Cassandra.
    Father Forgive Me… (20): Defeat the Priest.
    The Meating (15): Defeat the Butcher.
    Grindhouse (15): Perform 100 chainsaw kills.
    Mow 'Em Down (15): Take out 1000 enemies.
    Make a Name For Yourself (10): Take out 100 enemies.
    Just Getting Started (5): Take out 20 enemies.
    And It Continues (25): Complete the single player campaign on Normal mode.
    Backstory (25): Complete the co-op campaign.

Outfits
    Dance Shank: Complete the Single Player Campaign on Normal Mode
    Deathspank: Press Up, X, Down, B, Left, Y, Right, A at the View Unlocks Screen after beating the game
    GIMP: Kill 500 creatues (rats, bats, etc)
    Grindhouse costume: Get 100 Chainsaw Kills
    Horror Shank: 100 Kills with the Chainsaw (also unlocks the Grindhouse achievement)
    Red Ninja Outfit: Perform a 150-hit combo
    Shank the Spartan: Complete the Backstory (Co-Op)
    White Ninja Outfit: Perform a 100-hit combo
    Wildman: Complete the Single Player Campaign on Hard Mode
    Yellow Jumpsuit: 1000 Kills total

Unlock Concept Art
    Concept Art: Get 100 Shank Kills.
    Concept Art: Get 100 Grenade Kills.

Unlock Gamer Picture
    During the game, get 100 Shotgun Kills.