Hybrid

For this achievement I strongly suggest you level up and earn another token for your shotguns in the armory. That way, you can unlock the double barrel shotgun and improve your odds of getting this. Once you've obtained this, simply try and line up a shot of two players or drones and kill them with a single shot. If somebody has a stalker this should be fairly easy to sneak up on them with. Just need a little bit of luck.