So apparently you don't get the full ending to Arkham Knight unless you complete the game 100%. And amazingly, it's getting some people all kinds of pissy. Oh, God forbid we get some kind of interesting reward for taking the time to do all the side stuff. It's something we don't see nearly enough these days. All you get most of the time is an achievement. Now I'm kind of an achievement whore myself, so it's not THAT bad, but it's nice to see a game actually giving you something meaningful for putting in the extra effort.