This achievement is easiest done on normal difficulty (has to be normal or higher), at the beginning of Pillar of Autumn. As you start the level run up to the edge of the cliff. Look over and you will see an Elite with some Grunts next to a semi truck. After you hear Emile say “race you to her” wait for the Elite to move closer in. (sometimes it takes a few extra seconds for him to move) Then back up and sprint off of the cliff. When you’re far enough out to hit the Elite hit LB button again to stop sprinting, then before you land on the Elite hold down RB to perform the assassination. This took me around 60 attempts before I finally got it. So if you don’t get it right away don’t worry you’re not alone. It will come eventually.
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Other Halo Reach Achievements: