Even though the achievement says hacked security, I was able to get this using the automatic turret thats deployed by the remote hack tool. By far the easiest way is to stock up on these and use them when gathering ADAM with the little sisters. Much easier than luring enemies to hacked turrets and cameras.
Another trick is to let a camera see you, than hack the bots it sens at you. Once you have 2-3 bots their barrage should also net you some kills, especially while gathering.