Knight in White Assassination Achievement in Halo: The Master Chief Collection

The best chapter to get this achievement is on Episode 1, Chapter 4. In addition to this, it’s highly recommended to create a Halo 4 custom loadout through the “customization” tab of the Main Menu with the Promethean Vision armor ability.

After completing the inital objective (activating the switch) at the start of this mission, clear out the room of Crawlers and stat heading back out of the hallway that you came from. At this point, you will be informed via Palmer that there is a Promethean Knight around the corner. As soon as you hear this, activate Promethean Vision in order to track the Knight’s movement. You will notice the Knight paces back and forth down the hallway. As soon as its back is turn, run up behind the warrior and hold your melee button to perform an assassination, thus unlocking the achievement.

If you are playing this mission with another player, you can avoid the “sneaky route” by allowing one player to distract the Knight while the second player runs up behind for an assassination. For a visual guide in completing this achievement, go ahead and check out the video below.