Complete 2 matchmaking War Games matches.
Win 2 matchmaking King of the Hill matches.
Complete Midnight solo on Legendary difficulty.
Complete any Campaign Mission on Heroic or higher difficulty with the Tilt skull.
Kill 50 Elites.
Kill 60 Crawlers.
Get 200 kills with an Automatic Loadout Weapon.
Win 6 matchmaking Dominion matches.
Kill 1500 Players.
The Cortana one was featured on Halo Waypoint, still hoping to see my Master Chief one up as well.
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