Were you looking for the Halo 3 achievement of the same name, or John-117?

Demon is an achievement in Halo 2 Vista and Halo: The Master Chief Collection. It can be obtained by completing any level without dying on Normal or above.

The Halo 2 Vista achievement is worth 25 Gamerpoints and is represented by a flame, with the head of John-117 on top.

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