Assassinated a Knight in any Spartan Ops mission.
Completed Chapter 4, Episode 5 of Spartan Ops without losing a generator on Heroic or harder.
In Ch 1, Ep 5 of Spartan Ops survived the enemy assault during the defense on Normal or harder.
Completed a Challenge.
Completed 25 Challenges.
Changed your Spartan's armor in the Spartan Armor card.
Changed your Emblem in the Spartan ID card.
Changed your Service Tag in the Spartan ID card.
Changed your Spartan's pose in the Spartan ID card.
Created and saved a Custom Map in Forge.
Created and saved a Custom Game type in War Games.
Saved a Screenshot from the Theater.
Saved a Film Clip from the Theater.
Uploaded a File to your File Share.
Completed the Campaign cooperatively on Heroic or harder.
In Crimson DLC matchmaking, got a kill while airborne in a Warthog.
In Crimson DLC matchmaking, killed 20 enemies with a detached Machine Gun Turret.
In Crimson DLC matchmaking, killed a player while airborne from a Man Cannon.
In Crimson DLC matchmaking, killed 20 enemies using the Mantis' stomp attack.
In Crimson DLC matchmaking, boarded an enemy Mantis.
In Crimson DLC matchmaking, scored the killing blow on a Mantis.
In Crimson DLC matchmaking, shot an enemy who's airborne from a Man Cannon.
In Crimson DLC matchmaking, killed an enemy with melee when landing from a Man Cannon.
In Majestic DLC matchmaking, assassinated an enemy who's in zoom mode.
In Majestic DLC matchmaking, performed 5 'airsassinations.'
In Majestic DLC matchmaking, got the 'Close Call' medal twice during one match.
In Majestic DLC matchmaking, killed 5 enemies while Promethean Vision is active.
In Majestic DLC matchmaking, killed 5 enemies while Active Camo is active.
In Majestic DLC matchmaking, got a Double Kill or higher with one Pulse Grenade.
In Majestic DLC matchmaking, got 4 kills using the SAW without dying.
In Majestic DLC matchmaking, kill 3 enemies while they are using Jet Packs.
In Majestic DLC matchmaking, called in 3 ordnance drops during the same game.
In Majestic DLC matchmaking, perform a melee kill right after using Thrust Pack.
In Castle DLC matchmaking, disabled a vehicle and then hijack it.
In Castle DLC matchmaking, got two direct Spartan Laser kills in one match.
In Castle DLC matchmaking, healed a near-death teammate with Regen Field 5 times.
In Castle DLC matchmaking, assassinated an enemy who is using a Hardlight Shield.
In Castle DLC matchmaking, disintegrated 6 enemies using Forerunner weapons.
In Castle DLC matchmaking, performed 5 melee kills in a single match.
In Castle DLC matchmaking, completed a match in any mode for each Castle map.
In Castle DLC matchmaking, destroyed 2 vehicles during a single game.
In Castle DLC matchmaking, killed 5 enemies during a match by running them over.
In matchmaking, assassinated the ball carrier within five meters of your own goal in Ricochet.
In matchmaking, scored three times in one round of Ricochet.
In matchmaking, scored by throwing the ball from 30 meters in Ricochet.
In matchmaking, survived three vehicle explosions in a row with the Survivor package.
In matchmaking, scored a goal in Ricochet while taking damage with the Resistor active.
In matchmaking, recovered full shields from low health with both Resistor and Recharge active.
In matchmaking, effectively camped one location without dying for a full 60 seconds.
In matchmaking, got four consecutive kills with the Rocket Launcher without dying.
In Bullseye DLC matchmaking, activated both electrical surge systems during a match on Vertigo.
In Bullseye DLC matchmaking, acquired the Rocket Launcher at the start of a match on Pitfall.
Completed mission 1 on any difficulty.
Completed mission 2 on any difficulty.
Completed mission 3 on any difficulty.
Completed mission 4 on any difficulty.
Completed mission 5 on any difficulty.
Completed mission 6 on any difficulty.
Completed mission 7 on any difficulty.
Completed mission 8 on any difficulty.
Completed the Campaign on Normal or harder.
Completed the Campaign on Heroic or harder.
Completed the Campaign on Legendary difficulty.
Completed the Campaign solo on Legendary difficulty.
Completed any Campaign mission with 3 or more Skulls on Heroic or harder.
Completed any Campaign mission cooperatively on Heroic or harder.
Found a Terminal in the Campaign.
Found all of the Terminals in the Campaign.
Found and accessed Chief's record in mission 1.
Got significant air in the Warthog at midnight in mission 2.
Carried a UNSC weapon all the way through mission 3 on Heroic or harder.
Completed mission 4 without one preventable Marine death on Heroic or harder.
Stole a Wraith and used it to kill at least four enemy Wraiths in mission 5 on Heroic or harder.
Tricked or forced a Hunter to fall to his demise in mission 6.
Took out both Hunters using only the Sticky Detonator in mission 7.
Killed 3 Crawlers in one hit with the Gravity Hammer in mission 8.
Ranked up your Spartan-IV to SR-5.
Ranked up your Spartan-IV to SR-20.
Won 5 War Games matchmaking matches.
Won 20 War Games matchmaking matches.
Completed a Spartan Ops Mission on any difficulty.
Completed all chapters in Spartan Ops Episode 1 on Legendary difficulty.
Completed all chapters in any 5 episodes of Spartan Ops on any difficulty.
Completed a Spartan Ops chapter solo on Legendary.
Found one of the RvB Easter Eggs in Episodes 1 to 5 of Spartan Ops.
Saved at least one Marine in Chapter 3 of Episode 2 of Spartan Ops on Heroic or harder.
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