Stunned Achievement in Alien: Isolation
Knocked down a human or stunned an android with a non-lethal attack
How to unlock Stunned
To knock down a human, throw a flashbang at him/her. To stun an android, chuck an EMP mine at it.
A great opportunity to get this achievement is during mission four, “Seegson Communications.”
Once you reach Internal Communications and get the cutscene with Samuels, you'll find a save station towards a small side room on your right. Next to the save station is a blueprint of the EMP mine on a table.
Construct the EMP mine and toss it at one of the androids when you make your way back to the elevator.