Earn 15 Killing Spree medals.
Win 2 matchmaking Flood matches.
Complete Dawn solo on Legendary with all skulls on.
Complete Requiem solo on Legendary difficulty.
Kill 40 Crawlers.
Kill 50 Watchers.
Kill 100 Players with a headshot.
Earn 40 Combat Skill Medals.
Kill 2000 Players.
I think someone may have confused going "heads up" with going "head-to-head". Just sayin'.
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