I got killed by a Thrusty and the achievement didn't register. I got myself killed by one again on purpose and it still didn't register. I don't know if it's a problem on your side or on Valve's side, but I thought it might be worth mentioning. By the way: You've made an incredibly fun game. I can't believe how I've sunk over 30 hours into it within a week.
get killed by Dredmor and u'll see that achievement popping up, then you'll rage cuz dredmor does not give you the achievement for getting killed by him lol.
Yep. Had that happen to me. Got killed by Dredmor, got the "More Humps" Achivement. Lolwut? Also fun: had a thunderstorm last week and my Internet provider was down for several hours. So, I run Dredmor.exe to skip the "log in thru Steam" crap, and proceed to finally kill Dredmor for the first time. Of course, since I was "playing offline", I didn't get the "you killed Dredmor" achievement, and even after logging back into Steam, it won't retroactively recognize the fact that I killed him, despite the "vanquished Lord Dredmor" score on the score screen. *sigh*