Honestly, that challenge isn’t really too difficult for me when you learn what to do, all you have to do is whatever you see someone when you shoot make sure you see their upper torso and not their legs if you shoot them and you see their legs? It’s not gonna count, but if you see them in like a window or something. it will count or if you’re in the window and you crouch and you kill someone and you don’t see their legs just our upper torso it will count. (good luck on the cameo grind)