Prey
58 Achievements
85-110h
Suicide by Proxy
Details for this achievement will be revealed once unlocked
27.3%
How to unlock the Suicide by Proxy achievement in Prey - Definitive Guide
After visiting Dr. Calvino's Lab you will make your way back to your office and you'll meet January for the first time. Make a save here and kill her/him for the achievement/trophy and don't worry, it wont fight back.
I waited until "Before I give you the keys" went back to my office and killed him and the achievement still popped.
I'm not sure if the achievement still works towards the ending sequences of the game, see the spoiler area for more information.
Or if you’re playing through to the end of the game, following the nullwave option will force you to shoot January anyway. The trophy will still unlock even though it’s the last thing you do in the story.
When you first visit your own office you will meet the operator January.
Just shoot it dead.
After speaking with January, make a manual save of the game. After saving, proceed to shoot and kill January. Upon doing so, the trophy will unlock. Reload your save afterwards.
After repairing the Looking Glass server connection in Hardware Labs, return to your office in the Talos 1 Lobby. Resume watching the video you left yourself. Once it is over, January will appear and introduce him/herself. I'd recommend saving your game here. Then destroy January. They won't fight back, and the achievement will be yours. Then reload your save, because January will be helpful throughout the story.
After repairing the Looking Glass server connection in Hardware Labs, return to your office in the Talos 1 Lobby. Resume watching the video you left yourself. Once it is over, January will appear and introduce him/herself. I'd recommend saving your game here. Then destroy January. They won't fight back, and the achievement will be yours. Then reload your save, because January will be helpful throughout the story.