Win 4 matchmaking Slayer matches.
Earn 18 Combat Skill Medals.
Complete any Campaign Mission on Heroic or higher difficulty with the Famine skull.
Complete any Campaign Mission on Heroic or higher difficulty with the Tilt skull.
Kill 75 Crawlers.
Kill 125 Grunts.
Win 15 matchmaking War Games matches.
Win 10 matchmaking Capture the Flag 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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