Press ~ during game play to display the console window, then activate the following cheats by entering the corresponding codes:

CHEAT FUNCTION - CHEAT CODE
God mode - GodMode()
Full health - FullHealth()
Mission skip - NextMission()
Spawn FRF2 sniper rifle - Cheat.GiveWeaponFRF2();
Spawn HK PSG1 sniper rifle - Cheat.GiveWeaponHKPSG1();
Spawn HK USP pistol - Cheat.GiveWeaponHKUSP();
Spawn LRAC89 bazooka - Cheat.GiveWeaponLRAC89();
Spawn SPAS12 shotgun - Cheat.GiveWeaponSPAS12();
Spawn Milkor MGL140 grenade launcher - Cheat.GiveWeaponMilkorMGL140();
Spawn MP5sd6 machine gun - Cheat.GiveWeaponMP5sd6();
Spawn RPG7 rocket launcher - Cheat.GiveWeaponRPG7();
Spawn Famas assault rifle - Cheat.GiveWeaponFamas();
Spawn M1911 - Cheat.GiveWeaponM1911();
Get ammunition - Cheat.AddAmmo();