I'm going to 100% Skyrim when I get it back. I just got Fallout 3 and have 9 achievements in under 15min of gameplay. They need to make the games harder, but then it wouldn't be as fun.
Like Dack said, the game is easy. Also if you have any trouble, just use the PC version. Also I've had two accounts and a lot of saves on those accounts, so I'm really good at the game I'd say.
I've 100% Fallout 3 twice. Pc and Xbox 360. Its so good. I have other games buy them, but i need to know i have alot of time aha.