James Bond 007 - NightFire cheats and cheat codes for Gamecube

Unlock  Shelby Cobra
Pause the game play, hold L and press Right, Right, Left, Left, Up, then 
release L while racing on the Enemies Vanquished.

Bonus race
Pause the game play, hold L and press X, X, B, B, Y, then release L.
while racing on the Enemies Vanquished.

Get SUV
Pause the game play, hold L and press B, X, Y, B, Y.
while racing on the Enemies Vanquished.

Enter the following codes at the "Secret Unlocks" screen:

Unlockable upgrades:
All gadget upgrades: Enter "Q LAB" 
Bigger clip for sniper rifle: Enter "MAGAZINE"
Rifle scope upgrade: Enter "SCOPE"
Camera upgrade: Enter "SHUTTER"
Decrypter upgrade: Enter "SESAME"
P2K upgrade: Enter "P2000"
Golden P2K: Enter "AU P2K"
Golden PP7: Enter "AU PP7"
Grapple upgrade: Enter "LIFTOFF"
Laser upgrade: Enter "PHOTON"
Stunner upgrade: Enter "ZAP"
Tranquilizer dart upgrade: Enter "SLEEPY" 
Vanquish car missile upgrade: Enter "LAUNCH"
All multi-player options: Enter "GAMEROOM"

Unlockable stages:
Stage selection: Enter "PASSPORT"
Alpine Escape stage: Enter "POWDER"
Chain Reaction stage: Enter "MELTDOWN"
Countdown stage: Enter "BLASTOFF"
Deep Descent stage: Enter "AQUA"
Double Cross stage: Enter "BONSAI"
Enemies Vanquished stage: Enter "TRACTION"
Equinox stage: Enter "VACUUM"
Island Infiltration stage: Enter "PARADISE"
Nightshift stage: Enter "HIGHRISE"
Phoenix Fire stage: Enter "FLAME"

Unlockable characters and options in multiplayer mode:
Assassination option: Enter "TARGET"
Demolition option: Enter "TNT"
Explosive Scenery option: Enter "BOOM"
GoldenEye Strike option: Enter "ORBIT"
Protect option: Enter "GUARDIAN"
Team King Of The Hill option: Enter "TEAMWORK"
Uplink option: Enter "TRANSMIT"
All characters: Enter "PARTY"
Baron Samedi: Enter "VOODOO"
Bond Spacesuit: Enter "ZERO G"
Bond Tuxedo: Enter "BLACKTIE"
Christmas Jones: Enter "NUCLEAR"
Drake: Enter "NUMBER 1"
Elektra King: Enter "SLICK"
Goldfinger: Enter "MIDAS"
Jaws: Enter "DENTAL"
Max Zorin: Enter "BLIMP"
May Day: Enter "PHOTON"
Nick Nack: Enter "BITESIZE"
Oddjob: Enter "BOWLER"
Pussy Galore: Enter "CIRCUS"
Renard: Enter "HEADCASE"
Scaramanga: Enter "ASSASSIN"
Wai Lin: Enter "MARTIAL"
Xenia Onatopp: Enter "JANUS"


Unlockable rewards:
Finish the indicated stages to unlock rewards in multiplayer mode:

Unlock Zoe Nightshade card, Oddjob, Baron Samedi, Pistol upgrade.
Finish The Exchange stage

Unlock Military Snowmobile card, Assassination, Grapple, Max Zorin
Finish the Alpine Escape stage

Unlock Dominque card, Jaws, Renard, Missile upgrade.
Finish the Paris Prelude stage

Unlock Rook card and Wai Lin
Finish the Chain Reaction stage 

Unlock Ultralight card, Protection
Finish the Island Infiltration stage

Unlock Drake card and Explosive Scenery
Finish the Countdown stage

Unlock Vanquish Submarine card and Nick Nack
Finish the Deep Descent stage

Unlock Mayhew card, Uplink in mplayer mode, Rifle upgrade, Xenia Onatopp
Finish the Double Cross stage

Unlock Vanquish Car card, Scaramanga, May Day, Camera upgrade.
Finish the Enemies Vanquished stage

Unlock James Bond card, GoldenEye Strike, Rifle upgrade, Bond Space Suit
Finish the Equinox stage

Unlock Kiko card, Team King Of The Hill
Finish the Night Shift stage

Unlock Alura card and Demolition
Finish the Phoenix Fire stage

Unlock Platinum Medals
Finish a stage on the 00 Agent difficulty mode