Just finished my no-kill-no-detect-no-magic playthrough. Painstakingly finished every mission with no kills (as confirmed by the mission stats sheet: 0 kills with a checked box), no detects, and without upgrading or purchasing any additional powers past blink level 1. Upon completion I received the achievement for non-detect and no upgraded powers, but NOT the no kill or the nokill/nodetect combined achievement.
Checked the mission stats page for each mission, same, no kills, checked box...
Any idea what happened? My one suspicion is that I helped Slackjaw by burning Granny's amulet BUT sleep darted her without being detected. The game didnt count it as a kill, but still may consider it lethal for the achievement? I could instead just pickpocket key and leave them be?
On PC/Steam btw... Not that steam points count for anything, but still would be nice :'(
If you darted her then it's non-lethal. Might just be a glitch, failed to register or something.