Vidmaster Challenge: 7 on 7

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

Awww, Too Bad

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

Hammer Time

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

Citadel Skull

On Citadel, found the hidden skull.

Vidmaster Challenge: Brainpan

Found all the hidden skulls on the Mythic maps.

Steppin' Razor

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

Triple Kill

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

Killing Frenzy

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

Maybe Next Time Buddy

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

Marathon Man

Accessed all Terminals in the Campaign.

Orbital Skull

On Orbital, found the hidden skull.

Assembly Skull

On Assembly, found the hidden skull.

Sandbox Skull

On Sandbox, found the hidden skull.

Defend This

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

Tank Dropper

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

Heretic Skull

On Heretic, found the hidden skull.

Headshot Honcho

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

UNSC Spartan

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

Up Close and Personal

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

Lee R Wilson Memorial

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

Longshore Skull

On Longshore, found the hidden skull.

Graduate

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

MVP

Earned the MVP in a ranked playlist.

Return

Completed the final mission of the Campaign.

Campaign Complete: Normal

Completed the Campaign on Normal difficulty.

Mythic

Claimed Mythic skull.

Tilt

Claimed Tilt skull.

Last Stand

Completed the seventh mission of the Campaign.

The Key

Completed the eighth mission of the Campaign.

Cleansing

Completed the fifth mission of the Campaign.

Refuge

Completed the sixth mission of the Campaign.

The Road

Completed the third mission of the Campaign.

Too Close to the Sun

Destroyed a banshee with the spartan laser or missile pod in a ranked playlist or in campaign.

Thunderstorm

Claimed Thunderstorm skull.

Fog

Claimed Fog skull.

Famine

Claimed Famine skull.

Assault

Completed the fourth mission of the Campaign.

Holdout

Completed the second mission of the Campaign.

Catch

Claimed Catch skull.

Landfall

Completed the first mission of the Campaign.

Iron

Claimed Iron skull.

Fear the Pink Mist

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

Black Eye

Claimed Black Eye skull.

Tough Luck

Claimed Tough Luck skull.

Used Car Salesman

Destroyed a vehicle that has three enemies in it in a ranked playlist or in campaign.