Dastardly is one of the greatest achievements on the Xbox 360. I'm glad the its part of the list. I own roughly 20 games that I don't have the achievements for Over Achiever. Looks like I have work cut out for me...
100? I couldn't possibly get there. There's a few linked to strategy and fighting. In all my years of gaming, and with whatever skill I possess, they've always been my achilles heel. I just outright suck at them!
I could probably get to 75, but I'd have to seriously work at some of the hard list.
I haven't done all of the music ones yet; Dance Central eludes me. I need a new Kinect, as mine is broken.