This is not so much of a guide, but of a spoiler alert/warning/guide. At the end of the League of Assassins DLC, in the Season of Infamy, you will have to make one of two choices. Each choice will result in different endings, sort of like the Azrael quest line.
However, there is a way to experience both endings (at least this is what I did). After completing one of the options, exit the game and go all the way back to the Select Save Game screen. If you highlight the save you were just in, and hold
, it will revert the save to a backup save(you have to acknowledge that this is what you want to do). Basically, it will reset to the moment you make the choice in the Ra's al Ghul DLC, allowing you to choose the other ending. WARNING:
There are TWO backup saves. On my game, Ra's al Ghul was the last DLC I did, so my completion percentage was 220% (Thats full Story, Story+, and Season of Infamy). Reverting to Backup Save One took me to the Ra's choice, and 215%. However, if I pushed
again, it would revert to Backup Save Two, which was a whopping 182%. Please be careful about which backup save you revert to...
Spoiler is below, if you need to know.