Next cheats are active when you do next objectives; you can active them from option menu, cheats, press "Yes" on the cheat you prefer. Check the next list to know how getting them:

Cheats correct for all platforms:

All weapons: Complete Greece Time Trial, Complete Game.

Golden shotgun (killing one shoot): Complete Greece Time Trial, Complete Game.

Infinite energy: Complete Lost Island Time Trial, Complete Game.

Infinite ammo for guns gauge 50: Complete Egypt Time Trial, Complete Game.

Infinite ammo for shotgun: Complete Peru Time Trial, Complete Game.

Infinite ammo for subfusil mini: Complete Egypt Time Trial, Complete Game.

Silver subfusil mini: Complete Lost Island Time Trial, Complete Game.

Sunglasses: Complete Game.

Without textures mode: Complete Game.

Show enemy energy: Complete Peru Time Trial, Complete Game.

Infinite air: Complete Game.

Get Style Units: Complete Game with 100%.