Too Close to the Sun

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

Vidmaster Challenge: Lightswitch

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

Vidmaster Challenge: 7 on 7

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

MVP

Earned the MVP in a ranked playlist.

Fog

Claimed Fog skull.

Spartan Officer

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

Campaign Complete: Heroic

Completed the Campaign on Heroic difficulty.

Campaign Complete: Normal

Completed the Campaign on Normal difficulty.

Campaign Complete: Legendary

Completed the Campaign on Legendary difficulty.

Return

Completed the final mission of the Campaign.

The Key

Completed the eighth mission of the Campaign.

Last Stand

Completed the seventh mission of the Campaign.

Refuge

Completed the sixth mission of the Campaign.

Headshot Honcho

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

Cleansing

Completed the fifth mission of the Campaign.

Assault

Completed the fourth mission of the Campaign.

The Road

Completed the third mission of the Campaign.

Holdout

Completed the second mission of the Campaign.

Black Eye

Claimed Black Eye skull.

Landfall

Completed the first mission of the Campaign.

Iron

Claimed Iron skull.

UNSC Spartan

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

Used Car Salesman

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

Graduate

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

Up Close and Personal

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