Use a Health Pack to recover life after taking body damage.

Reach the rank of Corporal in the UNSC.

Complete the 3rd mission on Normal or harder.

Complete the 2nd mission on Normal or harder.

Complete the 4th mission on Normal or harder.

Purchase any item from the Armory.

Perform an Assassination on an enemy.

Kill 10 enemies in a Firefight or Campaign session with the DMR.

Complete the 7th mission on Normal or harder.

Complete the 9th mission on Normal or harder.

Complete the 8th mission on Normal or harder.

Kill the Elite Zealot before he can escape during the 5th mission.

Complete the 5th mission on Normal or harder.

Complete the 6th mission on Normal or harder.

Complete the Campaign on Normal difficulty.

Complete the 10th mission on Normal or harder.

Trade weapons with an AI ally in Campaign.

Kill 3 of the anti-aircraft batteries during the 8th mission.

Kill 10 Enemies in a Firefight or Campaign session with the M6G pistol.

Earn a Killing Spree in multiplayer Matchmaking.

Kill 2 vehicles at once with the Target Locator during the 3rd mission.

Earn a Triple Kill while Jetpacking in Campaign, Firefight or Matchmaking.

Earn a First Strike Medal in a Matchmaking game.

Recommend a file to someone.

Advance any Commendation to its Silver state.

Score 50,000 points in Firefight on any map.

Using the File Browser upload a file to your File Share.

Earn a Killionaire medal in Firefight.

Complete the Campaign on Heroic difficulty.

Let a teammate spawn on you 5 times in an Invasion Matchmaking game.

Score 200,000 points in Firefight on any map.

Complete a Firefight set on Legendary without dying.

Score 15,000 points in Score Attack Firefight Matchmaking.

Kill 10 enemies in Firefight or Campaign with a supercombine explosion.

As an Elite, kill 5 Spartan players in Matchmaking.

Hijack a Banshee during the Reach Campaign.

Score 1,000,000 points in Firefight on any map.

Complete a Weekly Challenge.

Win a game of Invasion in the 1st phase.

Destroy the Corvette's engines & escort in under 3 minutes in the 6th mission on Heroic or harder.

Complete all of the Daily Challenges in a given day.

Complete the Campaign on Legendary difficulty.

Kill 7 Moa during the 2nd mission of the Campaign.

Clear the 2nd mission without setting foot in a drivable vehicle.

Purchase an item from the Armory that requires the rank of Lt. Colonel.

Reach the rank of Captain in the UNSC.

Noble 1: Destroy a vehicle using Armor Lock in a matchmade game.

Finish the 9th mission on Legendary with the Scorpion intact.

Perform an Assassination against an Elite to survive a fall that would've been fatal.

Noble 1: Earn a Double Kill with the shotgun in multiplayer Matchmaking.

Noble 1: Kill a player at long range with the DMR in a matchmade Slayer game.

Complete each Campaign Mission on Legendary - alone.

Noble 1: Earn a kill in a matchmade Rocket Race game.

Anniversary: Get 3 headshot kills in a row in a matchmade game.

Defiant: Successfully return two flags in a matchmade CTF game.

Defiant: Kill 3 players with the Oddball in a matchmade Oddball game.

Noble 1: Collect all of the flags in a matchmade Stockpile game.

Noble 1: Earn a Double Kill from the Grave in multiplayer Matchmaking.

Noble 1: Blow up the research facility in a matchmade Invasion game on Breakpoint.

Anniversary: Perform a Beat Down on an enemy player while using the Jetpack during a matchmade game.

Defiant: Capture two flags from an enemy capture zone in a matchmade Stockpile game.

Defiant: Prevent the attacking team from touching the flag in a matchmade 1-Flag CTF game.

Anniversary: Run over 5 people with a vehicle in a matchmade game.

Anniversary: Capture 10 skulls at once in a matchmade Headhunter game.

Anniversary: Kill an enemy with their own Plasma Grenade that is stuck to you in a matchmade game.

Defiant: Be the last surviving uninfected player in a matchmade Infection game.

Defiant: Assassinate a player that just exited Armor-Lock in a matchmade game.

Anniversary: Infect 3 players in a single round in a matchmade Infection game.

Anniversary: Stick and kill the flag carrier with a Plasma Grenade in a matchmade game.