I just unlocked it... and thanks to Xbox One Game DVR, i can show you how i got it..
Look for wood posts with yellow tips, holding a ceiling that's ready to give, shoot them and they trigger a "ceiling collapse" levolution event.
Keep an eye on the map, and match the closest enemies to the closest "ceiling collapse" event. Be patient. Chances are they'll come towards those posts eventually.
About the video, I Don't think Game DVR records the actual "Achievement Unlocked" notification, but i assure you, i unlocked it with that kill.