NoSt109,881 Locked 20 Jun 2021 20 Jun 2021
Obviously, it's easier to do this on Classic.
I recommend going for this achievement early in the game as there are fewer enemies and the enemies are weaker.
I'd also suggest to do it with a Heavy and take a Frag Grenade. The ability to do wide area damage can be essential, if you are having difficulties dispatching the enemies.