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

Cleansing
Completed the fifth mission of the Campaign.

Assault
Completed the fourth mission of the Campaign.

Tough Luck
Claimed Tough Luck skull.

Black Eye
Claimed Black Eye skull.

Iron
Claimed Iron skull.

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

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

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

MVP
Earned the MVP in a ranked playlist.

The Road
Completed the third mission of the Campaign.

Holdout
Completed the second mission of the Campaign.

Landfall
Completed the first mission of the Campaign.