Video Guide
We can do this just about anywhere, but I’m doing this on mission 2 on the easiest difficulty at the apartments behind the library. We want to find an enemy and kill them, then booby trap their body with a grenade. We can then carry their body over to another guard, making sure to not get spotted, before placing it down near them. Once the enemy notices the body, we want to create a manual save and after they go to the body they will get blown up. We can then reload our manual save as many times as needed to pop the achievement!