On Assembly, found the hidden skull.
On Citadel, found the hidden skull.
On Heretic, found the hidden skull.
On Longshore, found the hidden skull.
On Orbital, found the hidden skull.
On Sandbox, found the hidden skull.
Found all the hidden skulls on the Mythic maps.
Claimed Thunderstorm skull.
Entered into a ranked or social playlist with 7 EXP on the 7th of the month.
Got the rank of Lieutenant in any playlist in the new EXP progression system.
On a Legendary map, got two Double Kills during a ranked or social match.
Claimed Catch skull.
Claimed Mythic skull.
Destroyed a banshee with the spartan laser or missile pod in a ranked playlist or in campaign.
Destroyed a vehicle that has three enemies in it in a ranked playlist or in campaign.
True veteran of many battles, you are a Spartan Officer.
Killed 5 enemies by melee or assassination in a ranked free for all playlist.
Promoted to Sergeant. Proven in combat, you are a Spartan.
Claimed Iron skull.
Claimed Black Eye skull.
Claimed Fog skull.
Claimed Famine skull.
Completed the final mission of the Campaign.
Completed the Campaign on Normal difficulty.
Completed the Campaign on Heroic difficulty.
Completed the Campaign on Legendary difficulty.
Completed the sixth mission of the Campaign.
Completed the eighth mission of the Campaign.
Claimed Tilt skull.
Claimed Tough Luck skull.
Graduated from basic training. Stick with it to earn your Spartan Insignia.
Completed the seventh mission of the Campaign.
Killed 5 enemies with the needler in a ranked free for all playlist or in campaign.
Completed the fifth mission of the Campaign.
Completed the fourth mission of the Campaign.
Earned the MVP in a ranked playlist.
Completed the first mission of the Campaign.
Completed the second mission of the Campaign.
Completed the third mission of the Campaign.
Scored a Double Kill with a single spartan laser shot in a ranked free for all playlist.
Killed 3 enemies within 4 seconds of one another in a ranked free for all playlist.
Killed 4 enemies within 4 seconds of one another in a ranked free for all playlist.
Scored 5 grenade sticks in any ranked free for all playlist.
Destroyed an enemy vehicle with equipment in a ranked playlist or in campaign.
Killed 10 enemies without dying in any ranked free for all playlist.
Scored a Triple Kill with the sword in a ranked free for all playlist.
Splattered an enemy with the mongoose in a ranked free for all playlist.
Killed 10 enemies with headshots in a ranked free for all playlist or in campaign.
Accessed all Terminals in the Campaign.
Boarded the same vehicle within 10 seconds after being boarded in any free for all playlist.
Earned over 15,000 points in the Campaign meta-game on the first mission.
Earned over 15,000 points in the Campaign meta-game on the second mission.
Earned over 15,000 points in the Campaign meta-game on the third mission.
Earned over 15,000 points in the Campaign meta-game on the fourth mission.
Earned over 15,000 points in the Campaign meta-game on the fifth mission.
Earned over 50,000 points in the Campaign meta-game on the sixth mission.
Earned over 50,000 points in the Campaign meta-game on the seventh mission.
Earned over 15,000 points in the Campaign meta-game on the eighth mission.
Earned over 15,000 points in the Campaign meta-game on the final mission.
After 9/25/08, completed Halo on 4-player Legendary LIVE co-op, with Iron, and everyone in Ghosts.
On a Legendary map, got 3 Oddball melee kills during a ranked or social match.
On a Legendary map, got 3 assassinations during a ranked or social match.
On a Legendary map, got a flag melee kill during a ranked or social match.
On a Legendary map, got 2 flag carrier kills during a ranked or social match.
On a Legendary map, got 5 Warthog chaingun kills during a ranked or social match.
On a Legendary map, got a Splatter Spree during a ranked or social match.
On Assembly, got 5 Hammer kills during a ranked or social match.
On Citadel, got a Shotgun Spree during a ranked or social match.
On Heretic, got a Sword Spree during a ranked or social match.
On Longshore, got 3 kills with a Ghost during a ranked or social match.
On Orbital, got 2 Death From the Grave medals during a ranked or social match.
On a Mythic map, got a Bulltrue medal during a ranked or social match.
On a Mythic map, got a Killjoy medal during a ranked or social match.
On a Mythic map, got a Killtacular during a ranked or social match.
On a Mythic map, got an Extermination during a ranked or social match.
On a Mythic map, got a Perfection medal during a ranked or social match.
On a Mythic map, infected 2 humans during a ranked or social match.
On a Mythic map, killed 2 Zombies during a ranked or social match.
On a Mythic map, got a kill on another player while in monitor mode.
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