Enter the following at the Secret Unlocks screen:

JANUS

Multiplayer mode Xenia Onatopp

ASSASSIN

Multiplayer mode Scaramanga

CIRCUS

Multiplayer mode Pussy Galore

BOWLER

Multiplayer mode Oddjob

PHOTON

Multiplayer mode May Day

BLIMP

Multiplayer mode Max Zorin

DENTAL

Multiplayer mode Jaws

MIDAS

Multiplayer mode Goldfinger

NUCLEAR

Multiplayer mode Christmas Jones

BLACKTIE

Multiplayer Bond Tuxedo

VOODOO

Multiplayer Baron Samedi

PARTY

Multiplayer All Characters

TRANSMIT

Multiplayer Uplink option

TEAMWORK

Multiplayer Team King Of The Hill option

GUARDIAN

Multiplayer Protect option

ORBIT

Multiplayer GoldenEye Strike option

BOOM

Multiplayer Explosive Scenery option

TNT

Multiplayer Demolition option

SCOPE

Multiplayer Assassination option

PASSPORT

Level select

MELTDOWN

Chain Reaction level

BLASTOFF

Countdown level

AQUA

Deep Descent level

VACUUM

Equinox level

FLAME

Phoenix Fire level

MAGAZINE

Bigger clip for sniper rifle

SLEEPY

Upgraded tranquilizer darts

TARGET

Platinum medal

Q LAB

All gadget upgrades

Extra race:

Get a Shelby Cobra: