All I had left was the Master Predator challenge. Police Brutality is pretty easy; Natural Selection slightly less so. End of the Line is the one that gave me problems. It took me 20+ minutes to stealth the shit out of it, but I finally did it. The only achievement I've got left is the one to use every move/gadget in a single combo; my problem with that is that there's so many fucking attacks that it's hard to keep track of which ones you've used and which ones you haven't. Also haven't done any of the achievements for the DLC; none of the characters (especially Catwoman) have anywhere near the same utility as Batman which makes it so much more of a grind. I can live without doing those.