|20 (Halo 4)
|Halo 4, Halo: The Master Chief Collection|
- Do this on a level that features only Prometheans so that there's room for trial and error.
- Make sure to have Promethean Vision equipped so that you can see when a Knight turns it's back without exposing yourself.
- This achievement also rewards the player with the Knight Helmet Avatar Award when unlocked.