I'm starting to get angry with some of these Syndicate achievements. I defeated the one boss without accessing these UAV bots to refill my ammo. You have to target the thing and then hold down LB, so it was pretty easy to simply not do that. No achievement.
Then I completed the one level without killing any civilians. While in your special vision mode the surroundings are gray, enemies are orange and civilians are blue. So once again it was pretty easy to make sure there was nothing blue anywhere on my screen before I started shooting. No achievement.
And for the record, I'm playing on normal. One of the achievements needs to be on normal or higher, the other doesn't specify a difficulty level.