From Halopedia, the Halo wiki
This article is about the Halo 2 Vista and Master Chief Collection achievement. For the Covenant term, see Demon. For the Halo 3 achievement, see Demon (achievement).
In the PC version of the game the achievement is worth 25 gamerpoints and is represented by a flame, with the head of the Master Chief on top. In The Master Chief Collection it is only worth 10 gamerpoints and is represented by a screenshot of the Master Chief aboard Cairo Station.