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Heroic: I'll Take You All On is an end game raid achievement, and most likely a reference to the 2009 movie Transformers: Revenge of the Fallen when Optimus Prime, while fighting multiple Decepticons, says, "I'll take you all on!" and proceeds to incapacitate several of them, all by himself.
can be found in the The Keepers of Ulduar, the third zone of the instance.