Halo: Reach - If They Came To Hear Me Beg Achievement

Performed an Assassination against an Elite to survive a fall that would've been fatal.

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Must be done on Normal difficulty or Harder.

This is best done on the mission: Pillar of Autumn, at the start of the mission, you will come to the edge of a cliff, at the bottom there will be 3 grunts and an Elite with their backs turned. Sprint of the edge, and as soon as you're off, stop the sprint. As you are falling, fall on his back. Just before you hit him, hold down RB to perform the assassination. This may take you a couple tries to do.

Hint - You must stop the sprint as soon as you jump. The game still thinks you are running and doesn't recognize that it would be a height big enough to kill you.