YOU ARE THE WEAPON
Kill a Hunter With 1 Pistol Round
Halo Combat Evolved YOU ARE THE WEAPON – Achievement Guide
Complete Skull and Terminal CHECKLIST(Halo 1-4 / Google Docs)
During the second mission you will face a couple of Hunters. To get this achievement you have to shoot at their red weap spot on the back. If you get close to one, he will try to run you over and expose his back to you. Quickly move to the side and turn around to land the shot.