Get 5 kills with a Secondary Weapon in a single match.
Assassinate 2 Players in a single match.
Complete Dawn solo on Legendary with all skulls on.
Complete Requiem solo on Legendary difficulty.
Kill 40 Jackals.
Kill 75 Crawlers.
Earn 35 Multikill medals.
Earn 30 Killing Spree medals.
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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