Call of Duty 4:
Mile High Club - Sky dive to safety on Veteran difficulty
I finally fucking got this achievement! It's taken me quite a few attempts, but thankfully I have completed it. I gave up on it last year and never really tried since. But tonight I decided to have a go and again I had to attempt it a few times. But the first chance I got with the Hostage I was determined not to miss. So I took my time and took the shot, headshot.
This is definitely one of the few achievements that I am actually proud to have. I'm just glad I never have to play that level again.