17.04%
… Get the Horns
On a Mythic map, got a Bulltrue medal during a ranked or social match.
17.70%
Tank Dropper
On a Mythic map, got a kill on another player while in monitor mode.
18.35%
Vidmaster Challenge: Brainpan
Found all the hidden skulls on the Mythic maps.
19.50%
Citadel Skull
On Citadel, found the hidden skull.
19.83%
Heretic Skull
On Heretic, found the hidden skull.
19.88%
Longshore Skull
On Longshore, found the hidden skull.
20.21%
Came… From… Behind
On a Legendary map, got 3 assassinations during a ranked or social match.
21.25%
Sandbox Skull
On Sandbox, found the hidden skull.
21.90%
Orbital Skull
On Orbital, found the hidden skull.
22.23%
Assembly Skull
On Assembly, found the hidden skull.
24.58%
Spartan Officer
True veteran of many battles, you are a Spartan Officer.
25.23%
Campaign Complete: Legendary
Completed the Campaign on Legendary difficulty.