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I beat the game in batman arkham asylum and its says I only finished 84 percent and I have gotten everything like the trophies biographies and everything can you tell me why

I beat the game in batman arkham asylum and its says I only finished 84 percent and I have gotten everything like the trophies biographies and everything can you tell me why
once you beat the game you have to get all the trophies and then beat all the challenges in the main menu