Halo 3

Claimed Famine skull.

Claimed Thunderstorm skull.

Claimed Tilt skull.

Claimed Black Eye skull.

Claimed Fog skull.

Completed the eighth mission of the Campaign.

Completed the third mission of the Campaign.

Claimed Mythic skull.

Completed the sixth mission of the Campaign.

On Longshore, found the hidden skull.

On a Mythic map, infected 2 humans during a ranked or social match.

Completed the Campaign on Heroic difficulty.

Killed 3 enemies within 4 seconds of one another in a ranked free for all playlist.

On Orbital, found the hidden skull.

On a Legendary map, got a flag melee kill during a ranked or social match.

Claimed Iron skull.

Claimed Catch skull.

On Heretic, got a Sword Spree during a ranked or social match.

On a Mythic map, got an Extermination during a ranked or social match.

True veteran of many battles, you are a Spartan Officer.

Earned over 15,000 points in the Campaign meta-game on the final mission.

Earned over 15,000 points in the Campaign meta-game on the fifth mission.

Destroyed an enemy vehicle with equipment in a ranked playlist or in campaign.

Completed the seventh mission of the Campaign.

Scored a Double Kill with a single spartan laser shot in a ranked free for all playlist.

On Longshore, got 3 kills with a Ghost during a ranked or social match.

On a Mythic map, killed 2 Zombies during a ranked or social match.

Killed 10 enemies without dying in any ranked free for all playlist.

Entered into a ranked or social playlist with 7 EXP on the 7th of the month.

On a Legendary map, got 5 Warthog chaingun kills during a ranked or social match.

Killed 10 enemies with headshots in a ranked free for all playlist or in campaign.

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 first mission.

Earned the MVP in a ranked playlist.

On Assembly, found the hidden skull.

On Heretic, found the hidden skull.

On Citadel, got a Shotgun Spree during a ranked or social match.

Scored a Triple Kill with the sword in a ranked free for all playlist.

On a Mythic map, got a Killtacular during a ranked or social match.

Got the rank of Lieutenant in any playlist in the new EXP progression system.

Earned over 15,000 points in the Campaign meta-game on the eighth mission.

Earned over 50,000 points in the Campaign meta-game on the sixth mission.

Accessed all Terminals in the Campaign.

Claimed Tough Luck skull.

On a Mythic map, got a Perfection medal during a ranked or social match.

On a Mythic map, got a Bulltrue medal during a ranked or social match.

Earned over 15,000 points in the Campaign meta-game on the fourth mission.

Scored 5 grenade sticks in any ranked free for all playlist.

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.

Killed 4 enemies within 4 seconds of one another in a ranked free for all playlist.

Boarded the same vehicle within 10 seconds after being boarded in any free for all playlist.

On a Legendary map, got a Splatter Spree during a ranked or social match.

Earned over 50,000 points in the Campaign meta-game on the seventh mission.

On a Legendary map, got two Double Kills during a ranked or social match.

Splattered an enemy with the mongoose in a ranked free for all playlist.

Completed the Campaign on Normal difficulty.

Graduated from basic training. Stick with it to earn your Spartan Insignia.

On Citadel, found the hidden skull.

Killed 5 enemies with the needler in a ranked free for all playlist or in campaign.

Completed the Campaign on Legendary difficulty.

On Orbital, got 2 Death From the Grave medals during a ranked or social match.

On Sandbox, found the hidden skull.

On a Legendary map, got 3 assassinations during a ranked or social match.

Killed 5 enemies by melee or assassination in a ranked free for all playlist.

Completed the final mission of the Campaign.

Completed the fourth mission of the Campaign.

After 9/25/08, completed Halo on 4-player Legendary LIVE co-op, with Iron, and everyone in Ghosts.

On a Mythic map, got a Killjoy medal during a ranked or social match.

On Assembly, got 5 Hammer kills during a ranked or social match.

Earned over 15,000 points in the Campaign meta-game on the second mission.

Promoted to Sergeant. Proven in combat, you are a Spartan.

On a Mythic map, got a kill on another player while in monitor mode.

Completed the fifth mission of the Campaign.

Found all the hidden skulls on the Mythic maps.

Completed the first mission of the Campaign.

On a Legendary map, got 2 flag carrier kills during a ranked or social match.

On a Legendary map, got 3 Oddball melee kills during a ranked or social match.

Completed the second mission of the Campaign.