Prey

Okay, so I think I've found a a way that one can lock oneself out of getting this achievement in a particular playthrough. Keep in mind that there will be spoilers in what follows:

So I ended up getting this quest just as the solution mentions, but when I entered the Crew Quarters I failed the "Cook's Request" mission and got the achievement for killing him. I never went back to fix the kitchen for him because I stupidly thought I needed Repair to do it and I wasn't using Neuromods, so when Dahl shows up his Military Operators kill the cook and Skillet. As I was trying to get through the game without killing humans, I wasn't sure if this would count against me, so I reloaded and avoided the area and moved the rest of the game forward. I finished the game and got the achievements for not killing humans and not using Neuromods, and then I reloaded an old save so I could acquire some abilities.

However, before I made the save I was using, I chose to incapacitate Dahl and allow Dr. Igwe to remove his Neuromods. So I get the mission again as I approach Crew Quarters, acquire the thing for Igwe and the mission tells me to meet Igwe in my office. However, when I get to the Lobby, the quest marker is not in my office, in fact it isn't anywhere. So I look Igwe up on the Security Terminal and his tracking bracelet puts him in Neuromod Division. I head over there and, sure enough, there he is still standing with Dahl just like they were when I left after he took Dahl's Neuromods.

However, he will not talk to me. There is not a prompt for a conversation and I do have the item he wants in my inventory. I believe he and Dahl are supposed to move to Shuttle Bay at some point, but I don't know if that happening will allow the dialogue to give him the item to come up. I finished the game using the Nullwave device and never had to go to Shuttle Bay since I didn't blow up Talos 1. I will try to see what happens if I blow up the station instead and see if he'll talk to me in Shuttle Bay, but I an very dubious that he will since the text of the quest specifically says to meet him in my office.

So, bottom line: try to get this out of the way before Igwe leaves your office somehow.