There is nexusmods if you want FC4 cheats but I never felt a need for that - weapons unlocker or money is unimportant coz you can collect it all no problem and there is no reward/achievement for this in FC4.
All that counts is achieving 100% mission completion throughout the game - more weapons are not useful since you need more ammo which is in the hands of the map designer - meh!
In MP there is cheating plenty to kick other players but many avoid MP due to just that...