The game is basically a port with flaws that reek of consoles. Changing the fov for pc is VERY helpful.
Damn right they should disable achievements. the developers made the game that way for a reason so they'd like you to you know, play the game the way it was intended? Low FOV makes things more claustrophobic and increases tension eg. Bioshock. If you can see 360 degrees in all directions there wouldn't be much suspense would there?
My Documents -> My Games -> Skyrim -> Skyrim.ini
Under [General] add: fdefaultfov=xx where xx = whatever number you want.
I did this on day one(set mine to 90) and I've gotten buckets of achievements since.