My first playthrough trying to get this achievement, I know where I missed it, I shot the gang leader with the Tranqaulizer Rifle and he showed the death's head, but I didn't redo it and lost the achievement. On my second try, I checked every person I put down and reloaded and redid if they had been killed, the gang leader again and a Bellflower solider forced a reload and redo after using the Tranqaulizer Rifle, everyone else was stacking Z's. Got to the last part, shutting down the Hyphon and killing Zhoa, did that and did not get the achievement. I'm about to say to hell with it, but it won't let me be. Is there any indication in the game where you can check and see, say after each area, if you've violated it. I do all the side quests and even save Malik and check everybody after the action is done and I'm missing something, somewhere; I'm thinking it's in the last boss fight sequence but don't know what to try differently. I haven't been using the Lazer Rifle to kill Zhoa and maybe it's taking too long and one of the soliders is being killed by the electricity or something, but that shouldn't count against me. Anyone got any suggestions? My have to just do the main story and sneak by everyone just to get this achievement, but that's kind of doing it the easy way in my book.
I'm afraid I don't have anything encouraging to offer. It's a very frustrating bug because the game does just sort of kill people on its own. But it's by no means impossible to get. I actually managed to get the achievement on my very first play through. I somehow missed it the second time around despite being as careful as it sounds like you are but then I got it again on my 3rd and 4th play throughs. And no, there's no way to know until the very end if you've failed it. At least you can look at it as incentive to try again :-)
One thing you didn't mention is if you killed the guards in the prologue (before you have any augs). Because if you did, that would fail the achievement. Seems kind of unfair, but there it is. Killing the bosses (including Zhao) does not count against you so that's not your problem. Dropping Diamond Chan off the root does count. Did you do that? Saving Malik or not does not matter.
As for being careful, obviously checking the bodies after to see if they're dead is good. I've heard reports of bodies dying when left in vents (never happened to me) so don't do that. I have seen bodies die when stacked, so don't stack them on each other. I've also killed bodies by bumping a cardboard box into them.
Heck, even if their bodies are found, you may not even lose any Ghost bonuses. There's only a few periods while in Detroit where you can get the bonus and I assume if the body isn't found during those periods, it's okay. Although, I wonder if the bodies could be found earlier and then found again later with both counting against you.
And I think the police will eventually calm down and return to neutral but I haven't done too much to get them excited.
Yeah, I see the same thing. It also seems that the platform specific feeds no longer work either. I used to subscribe to the Gamespot PC News feed (http://www.gamespot.com/rss/game_updates.php/?platform=5) but it's just a 404 now. I'm sure the RSS feeds are low on the priority list but at least some comment would be nice. Was this intentional and even remotely on a plan to address?