Hint: Never Say Die Bond Move:
On Evil Summit after you shoot the snipers, go to the tower on the left and use the remote on the green signal. You can use it as much as you want!

Full Cheat List:
As per usual in the Bond universe, there are a bunch of hidden cheats that are able to be unlocked. Each level has two cheats; one for single player, one for multiplayer.

To unlock single player cheats, you must obtain the Gold Medal on a level. To obtain a Gold Medal, you must receive a certain number of points, which varies by level.

To unlock multiplayer cheats, you obtain the Platinum Medal on a level. To do this you must not only obtain a Gold Medal, but also all of the 007 Bonus Tokens located in the level.

TROUBLE IN PARADISE:
Gold Medal Unlock: Golden Gun Gold Medal Target Score: 50,000
Platinum Medal Unlock: MP Map - Rocket Manor
The Golden Gun is a slightly more powerful version of the Wolfram P2K. However, this is only the beginning. By unlocking more cheats, you can obtain additions to the Golden Gun that will make it more and more powerful.
Obtaining the Platinum Medal unearths a new multiplayer map: Rocket Manor.

PRECIOUS CARGO:
Gold Medal Unlock: Golden CH-6 Gold Medal Target Score: 50,000
Platinum Medal Unlock: MP Game Mode - Golden Gun
The Golden CH-6 will replace the normal CH-6 rocket launcher that you find in the Rail Shooter levels. It is more powerful than the standard CH-6.
The Golden Gun play mode places a Golden Gun in the arena. The gun will kill anybody with one shot, making whoever has it a very dangerous person.

DANGEROUS PURSUIT:
Gold Medal Unlock: Unlimited Missiles Gold Medal Target Score: 70,000
Platinum Medal Unlock: MP Model - Stealth Bond
Unlimited Missiles is a cheat for Driving missions only. You will have an unlimited supply of the homing missiles, allowing for major destruction.
You can play as the Stealth Bond character model by receiving the Platinum Medal in this mission.

BAD DIPLOMACY:
Gold Medal Unlock: Golden Accuracy Gold Medal Target Score: 70,000
Platinum Medal Unlock: MP Powerup - Gravity Boots
Golden Accuracy is an upgrade for the Golden Gun. It will make the gun much more accurate. If you aim right at a target and fire, the bullet will travel in a straight line to right where you aimed.
The gravity boots are a multiplayer item that allow you to jump incredibly high. The boots lower the force of gravity upon your character, allowing for jumps that last longer, too.

COLD RECEPTION:
Gold Medal Unlock: Golden Clip Gold Medal Target Score: 90,000
Platinum Medal Unlock: MP Model - Guard
The Golden Clip doubles the amount of ammo you can hold in one Golden Gun clip, increasing it from 6 to 12 rounds.

NIGHT OF THE JACKAL:
Gold Medal Unlock: Golden Grenades Gold Medal Target Score: 90,000
Platinum Medal Unlock: MP Weapon - Viper
The Golden Grenades have more explosive power than normal grenades, killing most anyone unfortunate enough to get caught in their explosion. You will also go into every mission with some of these grenades.
Getting the Platinum Medal will allow you to use the Viper pistol in multiplayer.

STREETS OF BUCHAREST:
Gold Medal Unlock: Lotus Esprit Gold Medal Target Score: 100,000
Platinum Medal Unlock: MP Model - Alpine Guard
On the Driving levels, your car will be replaced with the sleek Lotus Esprit. Its machine guns are located in middle of the front of the car, allowing for more direct firing. Also, missiles shot travel closer to the ground.
The Alpine Guard is yours if you manage to secure the Platinum Medal.

FIRE & WATER:
Gold Medal Unlock: Rapid Fire Gold Medal Target Score: 100.000
Platinum Medal Unlock: MP Weapon - Calypso
The Rapid Fire cheat increases the speed at which you can fire the Golden Gun, making it all the more powerful.
Earning the Platinum Medal will get you the Calypso for use in multiplayer.

FORBIDDEN DEPTHS:
Gold Medal Unlock: Golden Armor Gold Medal Target Score: 110,000
Platinum Medal Unlock: MP Modifier - Full Arsenal
Golden Armor is tougher than normal armor, reducing the damage you take when hurt.
The Full Arsenal modifier to multiplayer changes things so that players spawn with every weapon. This makes for more frantic and possibly more fun matches.

POSEIDON:
Gold Medal Unlock: Golden Bullets Gold Medal Target Score: 120,000
Platinum Medal Unlock: MP Model - Cyclops Guard
Golden bullets are another upgrade for the Golden Gun. Golden Bullets are much stronger than normal bullets, which means you can take down enemies with less shots.
A new character model will be open if you get the Platinum Medal, the Cyclops Guard.

MEDITERRANEAN CRISIS:
Gold Medal Unlock: Regenerative Armor Gold Medal Target Score: 130,000
Platinum Medal Unlock: MP Model - Poseidon Guard
Regenerative Armor is incredibly helpful. When your armor is running low, it will slowly replenish itself automatically.
The Poseidon Guard is a new character model you receive for obtaining the Platinum Medal.

EVIL SUMMIT:
Gold Medal Unlock: Infinite Ammo Gold Medal Target Score: 130,000
Platinum Medal Unlock: MP Model - Carrier Guard
Infinite Ammo is an upgrade for the Golden Gun. With it, you never have to worry about running out of ammo.
The last new character model to unlock is the Carrier Guard.