I figured out a method that is super easy, and doesn't require you to risk death by using yourself as bait. When you get to the cemetery area in Chapter 2, there will be 3 enemies straight ahead past some rubble. Turn right and run, being sure not to alert them (which isn't very difficult). You'll run by a small rectangular structure, and then see a red marking on the large wall. By this point, you already know to hold
, and shine your flashlight on the symbol until the opening appears. When you crawl through, one of the cadaver enemies will crawl out of a tomb. Ignore him and pick up the bottle on the ground. Now, stand up, turn left, and walk up to the concrete barrier. Hold
to aim the bottle toward the entrance (you'll see light shining in from outside). Be sure to aim a bit inside the structure, and throw the bottle. The sound will alert the patrolling cadaver on the opposite side of the barrier, as well as the 3 enemies outside that I mentioned earlier. When one of the 3 step in, the cadaver will grab him and explode netting you the achievement.