Accomplish the indicated achievement to get the corresponding number of Gamerscore points:
| Unlockable: | How to unlock: |
| The Soldier We Need You To Be (Unknown) | Completed the Campaign on Normal difficulty. |
| Folks Need Heroes... (Unknown) | Completed the Campaign on Heroic difficulty. |
| Gods Must Be Strong (Unknown) | Completed the Campaign on Legendary difficulty. |
| A Monument To All Your Sins (Unknown) | Completed every mission in Halo Reach alone, on Legendary. |
| We're Just Getting Started (Unknown) | Completed the 2nd mission on Normal or harder. |
| Protocol Dictates Action (Unknown) | Completed the 3rd mission on Normal or harder. |
| I Need A Weapon (Unknown) | Completed the 4th mission on Normal or harder. |
| To War (Unknown) | Completed the 5th mission on Normal or harder. |
| You Flew Pretty Good (Unknown) | Completed the 6th mission on Normal or harder. |
| Into The Howling Dark (Unknown) | Completed the 7th mission on Normal or harder. |
| Dust And Echoes (Unknown) | Completed the 8th mission on Normal or harder. |
| This Is Not Your Grave (Unknown) | Completed the 9th mission on Normal or harder. |
| Send Me Out... With A Bang (Unknown) | Completed the 10th mission on Normal or harder. |
| They've Always Been Faster (Unknown) | Cleared the 2nd mission without setting foot in a drivable vehicle. |
| Two Corpses In One Grave (Unknown) | Killed 2 vehicles at once with the Target Locator in the 3rd mission. |
| Banshees, Fast And Low (Unknown) | Hijacked a Banshee during the Reach Campaign. |
| Your Heresy Will Stay Your Feet (Unknown) | Killed the Elite Zealot before he escaped during the 5th mission. |
| If They Came To Hear Me Beg (Unknown) | Performed an Assassination against an Elite to survive a fall that would've been fatal. |
| Wake Up Buttercup (Unknown) | Destroyed the Corvette's engines & escort in under 3 minutes in the 6th mission on Heroic or harder. |
| Tank Beats Everything (Unknown) | Finished the 9th mission on Legendary with the Scorpion intact. |
| Lucky Me (Unknown) | Earned a Triple Kill while Jetpacking in Campaign, Firefight or Matchmaking. |
| KEEP IT CLEAN (Unknown) | Killed 7 Moa during the 2nd mission of the Campaign. |
| I Didn't Train To Be A Pilot (Unknown) | Killed 3 of the anti-aircraft batteries during the 8th mission. |
| Doctor, Doctor (Unknown) | Used a Health Pack to replenish life after taking body damage. |
| That's A Knife (Unknown) | Performed an Assassination on an enemy. |
| I See You Favour A .45 (Unknown) | Killed 10 enemies in a Firefight or Campaign session with the M6G pistol. |
| An Elegant Weapon (Unknown) | Killed 10 enemies in a Firefight or Campaign session with the DMR. |
| Swap Meet (Unknown) | Traded weapons with an AI ally in Campaign. |
| A Spoonful Of Blamite (Unknown) | Killed 10 enemies in Firefight or Campaign with a supercombine explosion. |
| Be My Wingman Anytime (Unknown) | Let a teammate spawn on you 5 times in an Invasion Matchmaking game. |
| Yes, Sensei (Unknown) | Earned a First Strike Medal in a Matchmaking game. |
| Skunked (Unknown) | Won a game of Invasion in the 1st phase. |
| What's A Killing Spree? (Unknown) | Earned a Killing Spree in multiplayer Matchmaking. |
| Crowd Control (Unknown) | Earned a Killionaire medal in Firefight. |
| Knife To A Gun Fight (Unknown) | As an Elite, killed 5 Spartan players in Matchmaking. |
| Score Attack (Unknown) | Scored 15,000 points in Score Attack Firefight Matchmaking. |
| Firestarter (Unknown) | Scored 50,000 points in a Firefight game. |
| Blaze Of Glory (Unknown) | Scored 200,000 points in a Firefight game. |
| Heat In The Pipe (Unknown) | Scored 1,000,000 points in a Firefight game. |
| Game, Set, Match (Unknown) | Completed a Firefight set on Legendary without dying. |
| Make It Rain (Unknown) | Purchased an item from the Armory that required the rank of Lt. Colonel. |
| The Start Of Something (Unknown) | Reached the rank of Corporal in the UNSC. |
| An Honor Serving (Unknown) | Reached the rank of Captain in the UNSC. |
| A Storage Solution (Unknown) | Used the File Browser to upload a file to your File Share. |
| A New Challenger (Unknown) | Completed all of the Daily Challenges in a given day. |
| Make It Drizzle (Unknown) | Purchased an item from the Armory. |
| Cool, File Bro (Unknown) | Recommended a file to someone. |
| Lemme Upgrade Ya (Unknown) | Advanced a Commendation to a Silver state. |
| One Down, 51 To Go (Unknown) | Completed a Weekly Challenge. |
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