i can understand why you'd be frustrated with glitches in the game, but come on...its just an achievement...a minor annoyance at the worst...
A minor annoyance for anyone who cares little for achievements. Others, like myself (and I'm guessing the OP too), care quite a lot about earning the achievements that we intentionally play for, especially in games such as FNV where it could require 10s of hours of replay if it glitches first time.
For the OP, try the guide listed here for a proven quick method of gaining the achievement: http://www.trueachievements.com/a68145/hardcoe-achievement.htm?showguides=1. And while you're there, you should register, it's a great site for tracking achievements and finding guides etc.