Save at least one Marine in Chapter 3 of Episode 2 of Spartan Ops on Heroic or harder.

Find one of the RvB Easter Eggs in Spartan Ops.

Complete a Spartan Ops chapter solo on Legendary.

Complete all chapters in the first 5 episodes of Spartan Ops on any difficulty.

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

Win 20 War Games matchmaking matches.

Win 5 War Games matchmaking matches.

Rank up your Spartan-IV to SR-20.

In mission 8, kill 3 Crawlers in one hit with the Gravity Hammer.

In mission 6, trick or force a Hunter to fall to his demise.

In mission 5, steal a Wraith and use it to kill at least four enemy Wraiths on Heroic or harder.

Complete mission 4 without one preventable Marine death on Heroic or harder.

In mission 3, carry a UNSC weapon all the way through on Heroic or harder.

In mission 2, get significant air in the Warthog at midnight.

In mission 1, find and access Chief's record.

Find all of the Terminals in the Campaign.

Complete any Campaign mission cooperatively on Heroic or harder.

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

Complete the Campaign solo on Legendary difficulty.

Complete the Campaign on Legendary difficulty.

Complete the Campaign on Heroic or harder.

Complete the Campaign on Normal or harder.

In Castle DLC matchmaking, kill 5 enemies during a match by running them over.

In Castle DLC matchmaking, destroy 2 vehicles during a single game.

In Castle DLC matchmaking, complete a match in any mode for each Castle map.

In Castle DLC matchmaking, perform 5 melee kills in a single match.

In Castle DLC matchmaking, disintegrate 6 enemies using Forerunner weapons.

In Castle DLC matchmaking, assassinate an enemy who is using a Hardlight Shield.

In Castle DLC matchmaking, heal a near-death teammate with Regen Field 5 times.

In Castle DLC matchmaking, get two direct Spartan Laser kills in one match.

In Castle DLC matchmaking, disable a vehicle and then hijack it.

In Majestic DLC matchmaking, perform a melee kill right after using Thrust Pack.

In Majestic DLC matchmaking, call in 3 ordnance drops during the same game.

In Majestic DLC matchmaking, kill 3 enemies while they are using Jet Packs.

In Majestic DLC matchmaking, get 4 kills using the SAW without dying.

In Majestic DLC matchmaking, get a Double Kill or higher with one Pulse Grenade.

In Majestic DLC matchmaking, kill 5 enemies while Active Camo is active.

In Majestic DLC matchmaking, kill 5 enemies while Promethean Vision is active.

In Majestic DLC matchmaking, get the 'Close Call' medal twice during one match.

In Majestic DLC matchmaking, perform 5 'airsassinations.'

In Majestic DLC matchmaking, assassinate an enemy who's in zoom mode.

In Crimson DLC matchmaking, kill an enemy with melee when landing from a Man Cannon.

In Crimson DLC matchmaking, shoot an enemy who's airborne from a Man Cannon.

In Crimson DLC matchmaking, score the killing blow on a Mantis.

In Crimson DLC matchmaking, board an enemy Mantis.

In Crimson DLC matchmaking, kill 20 enemies using the Mantis' stomp attack.

In Crimson DLC matchmaking, kill a player while airborne from a Man Cannon.

In Crimson DLC matchmaking, kill 20 enemies with a detached Machine Gun Turret.

In Crimson DLC matchmaking, get a kill while airborne in a Warthog.

Complete the Campaign cooperatively on Heroic or harder.

Upload a File to your File Share.

Save a Film Clip from the Theater.

Save a Screenshot from the Theater.

Create and save a Custom Game type in War Games.

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

Complete 25 Challenges.

In Ch 1, Ep 5 of Spartan Ops survive the enemy assault during the defense on Normal or harder.

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

Assassinate a Knight in any Spartan Ops mission.