Earn 3 Multikill medals in a single match.
Earn 8 Killing Spree medals.
Complete any Campaign Mission on Heroic or higher difficulty with the Famine, Luck and Thunderstorm skulls.
Complete Infinity on Legendary difficulty with the Mythic, Tilt, Tough Luck and Thunderstorm skulls.
Kill 100 Elites.
Kill 200 Grunts.
Kill 175 Players.
Complete a War Games match with at least 15 kills without dying.
Win 80 matchmaking War Games matches.
The Cortana one was featured on Halo Waypoint, still hoping to see my Master Chief one up as well.
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