Didn't See It Comin'

From Halopedia, the Halo wiki

Didn't See It Comin'
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Didn't See It Comin' is a Halo 4 achievement added with the Majestic Map Pack. It is awarded when the player, in Majestic DLC matchmaking, assassinates an enemy who is zoomed in while using a scoped weapon or the HUD's built-in zoom function.[1]