When you complete the indicated level with a 'Platinum' rank and have collected ALL the 007 icons the corresponding feature becomes unlocked in multiplayer mode.

Unlock Viper Gun in Multiplayer Mode:
Complete the Night Of The Jackal level.

Unlock Calypso Gun in Multiplayer Mode:
Complete the Fire And Water level.

Unlock Golden Gun in Multiplayer Mode:
Complete the Precious Cargo level.

Unlock Gravity Boots in Multiplayer Mode:
Complete the Bad Diplomacy level.

Unlock Full Arsenal in Multiplayer Mode:
Complete the Forbidden Depths level.

Unlock Rocket Manor Multiplayer Level:
Complete the Trouble In Paradise level.

When you complete the indicated level with a 'Gold' rank the corresponding feature becomes unlocked.

Unlock Golden Gun:
Complete the Trouble In Paradise level.

Unlock Golden Clip Power-Up:
Complete the Cold Reception level.

Unlock Golden Bullet Power-Up:
Complete the Poseidon level.

Unlock Golden Armour Power-Up:
Complete the Forbidden Depths level.

Unlock Golden Grenade Power-Up:
Complete the Night Of The Jackal level.

Unlock Lotus Esprit Car:
Complete the Streets Of Bucharest level.

Unlock Regenerative Armour Power-Up:
Complete the Mediterranean Crisis level.

Unlock Unlimited Car Missiles:
Complete the Dangerous Pursuit level.

Unlock Golden CH-6:
Complete the Precious Cargo level.

Unlock Rapid Fire Power-Up:
Complete the Fire And Water level.

Unlimited Golden Gun Ammunition:
Complete the Evil Summit level.

When you complete the indicated level with a 'Platinum' rank and ALL the 007 icons the corresponding skin will be unlocked in multiplayer mode.

Unlock Stealth Bond Skin in Multiplayer Mode:
Complete the Dangerous Pursuit level.

Unlock Alpine Guard Skin in Multiplayer Mode:
Complete the Streets Of Bucharest level.

Unlock Cyclops Oil Guard Skin in Multiplayer Mode:
Complete the Poseidon level.

Unlock Poseidon Guard Skin in Multiplayer Mode:
Complete the Mediterranean Crisis level.

Unlock Guard skin in Multiplayer Mode:
Complete the Cold Reception level.

Unlock Carrier Guard in Multiplayer Mode:
Complete the Evil Summit level.

Try entering these codes between loading screens if you are struggling with the game and need some help of the cheating variety.

Unlock God Mode:
Press Start, Square, O, Triangle, X, Square, O, Start.

Unlock ALL Levels:
Press Start, Square, O, Triangle, Square, Square, O, Start.

No Clips:
Press Start, Square, O, Triangle, O, Square, O, Start.

Shoot in Silence:
During gameplay press 'Select' at any time.