Pause the game on the Enemies Vanquished level, then hold L and press Right(2), Left(2), Up.
Multiplayer: double K-40's
Choose any weapon choice for multiplayer that has the K-40 in it. Find it and find another or wait for it to come back again and pick it up. In short, find to K-40's. Key: You must be a Phoenix Character.
Unlock Golden P2K
Put in the code Q LAB (Must have the space).
Unlock Renard for Multiplayer
Put in the code HEADCASE. P.S. For all codes that tell you to put in a code, go to options and choose your screen name. Then you go to Secret Unlocks and enter the code.
Larger Sniper Rifle Clip
Put in the code MAGAZINE.
Unlock Max Zorin for Multiplayer
Put in the code BLIMP.
Goldeneye Strike
Put in the code Orbit.
Get SUV
On the Enemies Vanquished level while you are driving pause the game and HOLD L and press B,X,Y,B,Y.