Basic idea is to complete as much of the game as possible as Bruce. This includes collecting all possible Riddler trophies, breaking all possible balloons, and answering the first Zsasz phone call. Physical challenges aren't included because if you do them and then put on the Batsuit and look at the menu, it doesn't say you've done any physical challenges. Whereas the menu does say you've collected trophies and popped balloons even if it's done as Bruce. Biggest problem I can see with this is that it's always possible that more is doable beyond just what is done in my example run. Full example run: