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Run and Gunned

Halo: Reach: Headshot 10 enemies while they are sprinting.

Run and Gunned0
6 guidesOnline/OfflineSingle PlayerVersusCumulative +
03 Dec 2019 03 Dec 2019
24 2 0
Best game mode for this is SWAT as it is one shot headshots and the only armor ability is sprint.

Just filter social games for Reach, 4v4, SWAT.

I played one game of swat and naturally got two Headcase medals.

This CAN be boosted though if you are in a hurry to unlock. SWAT can be found under the slayer game type in custom games.