A Legendary Episode

Completed all chapters in Spartan Ops Episode 1 on Legendary difficulty.

What Power Outage?

Completed Chapter 4, Episode 5 of Spartan Ops without losing a generator on Heroic or harder.

Digging up the Past

Found and accessed Chief's record in mission 1.

Knight in White Assassination

Assassinated a Knight in any Spartan Ops mission.

Bromageddon

Completed the Campaign cooperatively on Heroic or harder.

Skullduggery

Completed any Campaign mission with 3 or more Skulls on Heroic or harder.

The Challenger

Completed 25 Challenges.

The Legend of 117

Completed the Campaign on Legendary difficulty.

I Need a Hero

Completed the Campaign on Heroic or harder.

Explore the Floor

Tricked or forced a Hunter to fall to his demise in mission 6.

The Cartographer

Created and saved a Custom Map in Forge.

Bropocalypse

Completed any Campaign mission cooperatively on Heroic or harder.

Wake Up, John

Completed the Campaign on Normal or harder.

Midnight

Completed mission 8 on any difficulty.

PWND

Changed your Service Tag in the Spartan ID card.

Composer

Completed mission 7 on any difficulty.

Shutdown

Completed mission 6 on any difficulty.

Reclaimer

Completed mission 5 on any difficulty.

Infinity

Completed mission 4 on any difficulty.

Forerunner

Completed mission 3 on any difficulty.

Contact the Domain

Found a Terminal in the Campaign.

Requiem

Completed mission 2 on any difficulty.

Movin' On Up

Ranked up your Spartan-IV to SR-20.

Dawn

Completed mission 1 on any difficulty.

Operation Completion

Completed a Spartan Ops Mission on any difficulty.

Hanging on the Combat Deck

Won 20 War Games matchmaking matches.

What a Poser!

Changed your Spartan's pose in the Spartan ID card.

Armorer

Changed your Spartan's armor in the Spartan Armor card.

Badge

Changed your Emblem in the Spartan ID card.

The Challenged

Completed a Challenge.

I <3 Red vs Blue

Won 5 War Games matchmaking matches.

Not Some Recruit Anymore

Ranked up your Spartan-IV to SR-5.