Well, I just finished my first playthrough, in which I had hardcoe mode activated the entire time, on the Xbox 360, and I received no achievement. I know I should have no reason to be frustrated as I didn't play hardcoe mode for the purpose of achievements, and I intend on playing through the game again on hardcoe anyway, but this still does annoy me to some extent. The only reason I could imagine would cause this would be the fact that I skipped the credits, but I think that'd be an odd reason not to give the achievement.
I noticed at the time that I didn't get an achievement but forgot about it until reading your post. So I guess that means I'm over it. :dance:
Oh, and I second that "badassness" of your username.