Game annoyed me. Completed it on the hardest setting, no kills, never seen by NPCs, and just pickpocketed granny rags to avoid the glitch where knocking her out kills her, and still didn't get the achievement for not killing anyone.
Apparently on the 360 it glitches a lot on trying to get this achievement, but I can't be arsed to go back through it.
Apparently on the 360 it glitches a lot on trying to get this achievement, but I can't be arsed to go back through it.