This Fallout 3 Console Commands and Cheats list provides everything you need to know, including how to enable cheat codes on PC to unlock the likes of god mode, complete all objectives, show all ...

dunno if F3 is the best "Bethesda" Fallout (FNVegas offers more Rpg and gameplay, while F4 slowmotion action feels monumentally at times and has addictive crafting/building), but F3 main story, ...