Master Cheat:

At the Character Select screen, press Square, L2, R2, Circle, Square, L1, L1, L2.

Unlock All Seasons In Sim Mode:
At any game menu, press L2, R2, Square, Circle, R1, R1, L1, Circle, Circle.

Skip Level:
During Season mode, pause the game, hold L3 and press Square, Circle, R1, L1, L2, Square, Square, Square.

Turbo Always On:
Pause the game, hold L3 and press X, L1, R1, R2, Triangle.

Faster specials:
Pause the game, hold L3 and press Triangle, Circle, Circle, Circle, Circle..

Get Kevin Nash:
At any game menu, press L2, Square, R2, Circle

Get Ric Flair:
Beat Season Mode with The Big Show, Rob Van Dam and Triple H.

Get Lita:
Beat Season Mode with Matt Hardy.

Get Christian:
Beat Season Mode with Chris Jericho.

Get Bradshaw:
Beat Season Mode with Brock Lesnar.

Get Vince McMahon:
Beat Season Mode, facing Vince in the final battle.

Get Stephanie McMahon:
Beat Season Mode with Kurt Angle.

Get Hulk Hogan:
Beat Season Mode with The Rock.

Demolition Derby mode:
Win a match without firing any weapons.

Thanks to Revolution readers Ty Young, Adri biba lll, Andre Pope and Davidjr!