Want to See the Full Ending of Batman: Arkham Knight? You'll Have to 100% Complete the Game

In fact, the game doesn't end after the main story ends.  In order to see the ending, you'll need to finish a bunch of most side quests.  But in order to see the really real ending, you'll have to finish everything.  Even the Riddler trophies.  Or, you know, just watch it on YouTube, cause ain't nobody got time for that.