I love Halo and Bungie. The only games you'll see me play thats NOT halo are Battlefield BC2 Battlefield 1943, Flight Sims, Oblivion, Skyrim, and Minecraft and CoD on occasion.
Alright, if you're having trouble getting this achievement, then do it the EASY way. It was the first achievemet I got and I got it BEFORE I got xbox LIVE! Heres how you glitch it. Start up Crow's Nest or Tsavo Highway and destroy the front turret on any phantom and you'll get it!(Includes SCOUT Helmet)