Oh I know, and for most games I don't, but in the case of games I really like I like to, and besides I've got so few left (and not even the hardest ones at that) that if I didn't at least try it would bug me
This is me. I don't give a single fuck about achievements, unless ive really enjoyed myself and (usually) only if I'm most of the way via my regular playthrough. Requiring multiple playthroughs is an immediate turn off, too many other games to get to lol.