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 (Halo 3 achievement).
In the PC version of the game the achievement is worth 25 Gamerscore 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 Gamerscore and is represented by a screenshot of the Master Chief aboard Cairo Station.