My latest achievement mission- Got sick of multiplayer so I've been trying to beat CoD 4 on veteran. Done it all on hardcore. Done every level on Veteran except Heat (barely tried, not optimistic), The Hunted (Stuck but extremely confident), Safehouse (Miserably hopeless) and Mile High Club (haven't tried in months but I'll do it).
Honestly, minus those few levels it was easier than I had anticipated it being. Not that it's been easy, but when I first got the game I tinkered with Veteran and concluded I'd never be able to do it. Really, if you go slow, use your resources, pick your cover and time your open runs well, it's generally not too difficult. And it's a totally different game. A lot more fun than the run and gun of easier difficult levels IMO. of a lot more realistic feeling anyway.
Considering only 3% of the people who own the game have even beaten Mile High on Vet. I'd bet there's less than 1% who've beaten the entire game (you have right jman?).
Anyway, I'm looking forward to joining that >1%

Cool. I played that game for like 90 hours and only found 4 or 5. I wasn't looking for them at all, but still, I wish I would've come across more. Finding more is on my agenda now that I'm going to be playing again via the Broken Steel DLC