Here is a list of the cheat codes for the Playstation 2 version of Nightfire. Hope that these help you.
All Multiplayer Characters
PARTY
All Multiplayer Scenarios
GAMEROOM
All Q Gadgets
Q LAB
Baron Samedi in Multiplayer
VOODOO
Bigger Sniper Rifle Clip
MAGAZINE
Bond Tux in Multiplayer
BLACKTIE
Camera Upgrade
SHUTTER
Christmas Jones in Multiplayer
NUCLEAR
Decryptor Upgrade
SESAME
Destruction Mode in Multiplayer
TNT
Drake Suit in Multiplayer
Number 1
Explosive Scenery in Multiplayer
BOOM
Faster Laser
PHOTON
Golden Gun
TARGET
Grapple Upgrade
LIFTOFF
Jaws in Multiplayer
DENTAL
King of the Hill mode
TEAMWORK
Max Zorin in Multiplayer
BLIMP
Mayday in Multiplayer
BADGIRL
Multiplayer Goldfinger
MIDAS
Nick Nack in Multiplayer
BITSIZE
Oddjob in Multiplayer
BOWLER
Protection Mode in Multiplayer
GUARDIAN
Pussy Galore in Multiplayer
CIRCUS
Renard in Multiplayer
HEADCASE
Rifle Scope Upgrade
SCOPE
Scaramanga in Multiplayer
ASSASSIN
Unlock all characters in multiplayer mode
PARTY
Unlock all gadget and weapon upgrades
Q LAB
Unlock all missions
PASSPORT
Unlock all scenarios in multiplayer mode
GAMEROOM
Unlock Alpine Escape
POWDER
Unlock Chain Reaction
MELTDOWN
Unlock Countdown
BLASTOFF
Unlock Equinox
VACUUM
Unlock explosive scenery envriomod in multiplayer mode scenarion options
BOOM
Unlock Golden PPK in Single Player
AU P2K
Unlock Goldeneye Strike in Multiplayer
ORBIT
Update the Tranquilizer
SLEEPY
Upgraded P2K
P2000
Uplink Mode in Multiplayer
TRANSMIT
Wai Lin in Multiplayer
MARTIAL
Xenia in Multiplayer
JANUS