Achievement Description: Complete the game without killing any humans.
Gamerscore:50G

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You are able to kill as many androids as you like, but you must not kill any humans. If you kill a friendly or hostile human on accident it is still possible to earn this achievement upon completing the game, as long as you reload a previous save as soon as you kill someone.

The human AI is pretty poor in comparison to the Xenomorph AI.

Enemy humans can spot you from greater distances when playing on hard difficulty, but if you use flares or other craftable items like smoke bombs, flashbangs, and noisemakers, you'll be able to distract humans with ease.

If you use noisemakers or flares, the human AI will notice it and will orient themselves so when they run up to the distraction, they will only focus on the distraction and ignore everything in their peripheral vision. If you get too close to their central vision/near focal vision they will start attacking you, but if that happens you can simply reload a save and try out a different approach.

There is no way to knock out or stun humans for long periods of time other than using flashbangs, but even flashbangs don't buy you a whole lot of time. The maintenance jack (basic melee weapon) and the stun rod will kill humans, so avoid using those. If you need a distraction just resort to the craftable items that aren't pipe bombs or Molotovs.

If you throw a noisemaker or flare to distract humans, the Xenomorph slides down from the vents to investigate, and then the Xenomorph proceeds to kill the humans, those kills will not count against you. Hostile androids can also kill a human if one steps in the path of the android, but those kills will also not count against you.