Full Attributes:
During gameplay press Pause, and then while holding L1 enter the following:
X, Triangle, Circle, Square, Triangle, Up, Down

Full Specials Meter:
During gameplay press Pause, and then while holding L1 enter the following:
X, Triangle, Circle, Circle, Up, Left, Triangle, Square

Bloody Gameplay:
During gameplay press Pause, and then while holding L1 enter the following:
Right, Up, Square, Triangle

Faster Game Mode:
During gameplay press Pause, and then while holding L1 enter the following:
Down, Square, Triangle, Right, Up, Circle, Down, Square, Triangle, Right, Up, Circle