James Bond 007: Everything or Nothing Cheats

In certain levels of the game, a platinum objective must be achieved by either using little or no ammo. I found these levels are made easier with this secret. If you dive forward or to the side while shooting, for some reason the game does not count you as shooting the weapon. Dive and shoot as many times as you want, and it won't count it as using ammo. As an added bonus, it will count it in the scoring at the end of the level, which means you can get unusually high amounts of weapon accuracy and effeicence. An example would be firing 0 rounds but having 67 hit, resulting in an accuracy rating of around 830%.

On the Platinum War, you dont have to do the objectives in order...
You can bypass the objective in which you must destroy the pillars under the Kremlin by simplying destroying them before disarming the bomb. If you do it before disarming the bomb, there will be no tanks there to fight you and you can take out the pillars quickly without losing health. After destroying the pillars, continue down the path and disarm the bomb. You will have the full amount of time, but now you only need to get out and take out the helicopter. The game will give you credit as if you took out the pillars under tank fire.

On the rail level, A Show of Force, when you get to the road block at the gas station, shoot the gas pumps before the little cutscene starts with the roadblock forming, if you blow them up before hand, as soon as the cutscene is over, all the roadblock will be destroyed as if you had shot them under fire of the roadblock. (you will still earn the Bond Moment)