When you press the console key (Tilda key) it disables you steam achievements until you restart the game. I'm sure this has been reported by now,I just want to make sure because I have missed out on quite a few achievements from accidentally hitting the console key.

Please report it here:

http://www.gamesas.com/topic/1544248-bug-report-index-pc/

It is probably intentional. Fallout: New Vegas introduced that "feature." They probably want to prevent you from using the console to get the achievements. Unfortunately for me, I like hiding the menus when I take screenshots. I missed several New Vegas achievements before I discovered it. Controlling players seems more Obsidian's style; I didn't think Bethesda would follow suit.

Except In Fo4 it isn't meant to. Lots of people use the console and still get achievs, myself included.