What are the predator challenge medal requirements in Batman Arkham Asylum?

What do you have to do to earn all of the medals in the predator challenges in Batman Arkham Asylum?What are the predator challenge medal requirements in Batman Arkham Asylum?
If it's on the 360 just press the back button on the controller when doing the challenge and it will tell you the requirements for each level.What are the predator challenge medal requirements in Batman Arkham Asylum?
You have to eat a whole bag of potato chips and one dorito, prefreably cool ranch.

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