Demon Achievement in Halo: The Master Chief Collection

Cairo Station is without a doubt one of the best missions to attempt this achievement given the fact that it’s the shortest mission within the entire Campaign. You’ll also come to realize that given the nature of the station’s design structure, it’s also the most confined mission in terms of navigable space for firefights. This provides for an excellent tactic in flushing out rooms with grenades and using close-to-medium-ranged weapons to kill the Covenant.

Make sure to utilize the Noob-Combo (Battle Rifle/Plasma Pistol) and grenades as often as possible when taking on groups of Covenant enemies inside the station. Since most of the corridors and hanger bays you fight within aren’t that large compared to other firefights within the Campaign, a single grenade can usually flush out most of the weaker Covenant units while the Noob-Combo is effective at medium range in killing Elites.

Another strategy is to tackle the aforementioned mission cooperatively with another player. This method is great since your partner can go forth and clear out all the enemies, while you stay back and avoid any and all crossfire between your partner and the Covenant. If you are successful in completing the mission without dying whatsoever, the achievement will unlock after the concluding cutscene.