James Bond 007: Everything or Nothing Cheats for GameCube

X,X,Y,L,B

Unlock the golden gun:
X,Y,A,X,Y

To unlock these, you need the amount of points shown.
Cistern 30 points
Test Lab 160 points
Burn chamber 370 points

Get the following number of points to unlock the corresponding character in multi-player mode:
50 points - Baron Samedi
70 points - Odd Job
90 points - Egypt Commander
110 points - Hazmat Guard
130 points - Mya Starling, alternate costume
180 points - Egypt Guard
210 points - South Commander
230 points - Moscow Guard
260 points - Le Rouge
290 points - 003
320 points - Katya jumpsuit
350 points - Serena St.Germaine
400 points - Diavolo Moscow
430 points - Serena St. Germaine alternate
450 points - Ms Nagai
Golden Gun
At the Pause screen, press the following combination:
X, Y, A, X, Y

By the way, these won't work unless you unlock them by getting platinum on 00 Agent difficulty.
Unlocked by getting 3 "Platinum" awards. Pause game play, then press X, A(2), B, Y.