Below is a complete list of the achievements associated with Halo: Reach in Halo: The Master Chief Collection.
| Name | Description | Gamerscore |
| We're Just Getting Started | Halo: Reach: Complete Winter Contingency. | 10 |
| Protocol Dictates Action | Halo: Reach: Complete ONI: Sword Base. | 10 |
| I Need A Weapon | Halo: Reach: Complete Nightfall. | 10 |
| To War | Halo: Reach: Complete Tip of the Spear. | 10 |
| You Flew Pretty Good | Halo: Reach: Complete Long Night of Solace. | 10 |
| Into The Howling Dark | Halo: Reach: Complete Exodus. | 10 |
| Dust And Echoes | Halo: Reach: Complete New Alexandria. | 10 |
| This Is Not Your Grave | Halo: Reach: Complete The Package. | 10 |
| Send Me Out..With A Bang | Halo: Reach: Complete The Pillar of Autumn. | 10 |
| Welcome to Reach | Halo: Reach: Complete every level of the game on Easy difficulty. | 10 |
| The Solider We Need You To Be | Halo: Reach: Complete every level of the game on Normal difficulty. | 10 |
| Folks Need Heroes… | Halo: Reach: Complete every level of the game on Heroic difficulty. | 20 |
| Gods Must Be Strong | Halo: Reach: Complete every level of the game on Legendary difficulty. | 30 |
| A Monument To All Your Sins | Halo: Reach: Complete every level of the game on Legendary difficulty, by yourself. | 30 |
| Winter Urgency | Halo: Reach: Beat the par time on Winter Contingency. | 10 |
| Just Like Storming a Castle | Halo: Reach: Beat the par time on ONI: Sword Base. | 10 |
| Now Just You Gueta Minute | Halo: Reach: Beat the par time on Nightfall. | 10 |
| Generous Tipper | Halo: Reach: Beat the par time on Tip of the Spear. | 10 |
| Sabre Metrics | Halo: Reach: Beat the par time on Long Night of Solace. | 10 |
| Quicker Than Reading the Book | Halo: Reach: Beat the par time on Exodus. | 10 |
| One For the Record Books | Halo: Reach: Beat the par time on New Alexandria. | 10 |
| Speedy Delivery | Halo: Reach: Beat the par time on The Package. | 10 |
| Wait, How'd the Ship Get Down Here? | Halo: Reach: Beat the par time on The Pillar of Autumn. | 10 |
| Fast Fall | Halo: Reach: Beat par time on all Halo: Reach levels. | 20 |
| Ice In Your Veins | Halo: Reach: Beat the par score on Winter Contingency. | 10 |
| Still Sharp | Halo: Reach: Beat the par score on ONI: Sword Base. | 10 |
| Moon's Out, Goons Out | Halo: Reach: Beat the par score on Nightfall. | 10 |
| Bake That Cake | Halo: Reach: Beat the par score on Tip of the Spear. | 10 |
| Insomnia | Halo: Reach: Beat the par score on Long Night of Solace. | 10 |
| Parting the Sea | Halo: Reach: Beat the par score on Exodus. | 10 |
| Nine Lives Are a Myth | Halo: Reach: Beat the par score on New Alexandria. | 10 |
| How Did I Lose All My Fingers? | Halo: Reach: Beat the par score on The Package. | 10 |
| Precious Cargo | Halo: Reach: Beat the par score on The Pillar of Autumn. | 10 |
| We'll Be Back | Halo: Reach: Beat the par score on every Halo: Reach level. | 20 |
| Remember Reach | Halo: Reach: Play a game of Halo: Reach on the 14th of any month. | 5 |
| Why Do This To Yourself? | Halo: Reach: Complete the Halo: Reach LASO Campaign playlist. | 30 |
| Who Needs Red Flag? | Halo: Reach: Complete three Halo: Reach playlists. | 20 |
| Reach Has Been Good to Me | Halo: Reach: Complete a Halo: Reach playlist. | 10 |
| Keep Your Foot on the Pedrogas | Halo: Reach: Complete all Halo: Reach Legendary campaign missions in under 3 hours. | 30 |
| Enemies Everywhere! | Halo: Reach: Complete a Firefight set on Normal or harder. | 10 |
| HBOrg Special | Halo: Reach: Party with the DJ Brute. | 5 |
| Hey, You Dropped This | Halo: Reach: Find Data Pad 1 on Winter Contingency. | 5 |
| Read Halsey's Journal | Halo: Reach: Find Data Pad 2 on ONI: Sword Base. | 5 |
| Meeting of the (Artificial) Minds | Halo: Reach: Find Data Pad 3 on Nightfall. | 5 |
| Rampant Speculation | Halo: Reach: Find Data Pad 4 on Tip Of The Spear. | 5 |
| Minority Report | Halo: Reach: Find Data Pad 5 on Long Night Of Solace. | 5 |
| Info Dump | Halo: Reach: Find Data Pad 6 on Exodus. | 5 |
| Paper Trail | Halo: Reach: Find Data Pad 7 on New Alexandria. | 5 |
| Terminal Conditions | Halo: Reach: Find Data Pad 8 on The Package. | 5 |
| Digital Destinies | Halo: Reach: Find Data Pad 9 on The Pillar Of Autumn. | 5 |
| Unreliable Narrator | Halo: Reach: Find Data Pad 10 on Winter Contingency on Legendary difficulty. | 5 |
| What Does It All Mean? | Halo: Reach: Find Data Pad 11 on ONI: Sword Base on Legendary difficulty. | 5 |
| Unsolved Mysteries | Halo: Reach: Find Data Pad 12 on Nightfall on Legendary difficulty. | 5 |
| Meddling and Madness | Halo: Reach: Find Data Pad 13 on Tip Of The Spear on Legendary difficulty. | 5 |
| The Answer is Simple | Halo: Reach: Find Data Pad 14 on Long Night Of Solace on Legendary Difficulty. | 5 |
| Of Patience and Partiality | Halo: Reach: Find Data Pad 15 on Exodus on Legendary difficulty. | 5 |
| Curious Composition | Halo: Reach: Find Data Pad 16 on New Alexandria on Legendary difficulty. | 5 |
| Silent Shepherds | Halo: Reach: Find Data Pad 17 on The Package on Legendary difficulty. | 5 |
| Assembled the Majority | Halo: Reach: Find Data Pad 18 on The Pillar Of Autumn on Legendary difficulty. | 5 |
| Yes No You Decide | Halo: Reach: Find Data Pad 19 on Lone Wolf on Legendary difficulty. | 5 |
| Canonical Conundrum | Halo: Reach: Find all Data Pads | 20 |
| Easy to Overlook | Halo: Reach: Access hidden UNSC radio chatter. | 10 |
| Front Page News | Halo: Reach: Find me in the club. | 10 |
| New Ways to Save a Buck | Halo: Reach: Hear a familiar voice on New Alexandria. | 10 |
| Did You Major in Marine Bio? | Halo: Reach: Encounter the hidden marines on Exodus. | 10 |
| What About Bob? | Halo: Reach: Find and eliminate one of the hidden Ranger Commander Elites. | 10 |
| Collection Eligibility Confirmed | Halo: Reach: See, he IS in the game! | 10 |
| No Picnic | Halo: Reach: Observe a grizzy scene on New Alexandria. | 10 |
| Confused Callouts | Halo: Reach: Trigger a humorous callout on your HUD's position indicator. | 5 |
| The Humble Beginnings of Wiljax Brantley | Halo: Reach: Now that's a value meal. | 10 |
| Mind the Skill Gap | Halo: Reach: Observe the logo of a buttoned-up mining company. | 10 |
| Clear and Present Danger | Halo: Reach: Pad on the run. | 5 |
| Fly, You Fools! | Halo: Reach: Find the hidden Banshees on The Package. | 5 |
| I'm Sorry, Dave | Halo: Reach: Find the hidden binary signature. | 5 |
| We're Gonna Need a Bigger Ship | Halo: Reach: Fly both the Pelican and Phantom on New Alexandria. | 5 |
| Jorge Can't Have All the Big Guns | Halo: Reach: Use a Pelican turret. | 5 |
| Forza in the Fall | Halo: Reach: Flip the switches to become a Reach Racer! | 5 |
| Play Us a Sad Song, Claude | Halo: Reach: Listen to a hidden music cue. | 5 |
| This is Not the Greatest Lab in the World… | Halo: Reach: Find your way into Halsey's Lab on The Package. | 5 |
| Keep It Clean | Halo: Reach: Kill 7 Moa during Winter Contingency. | 10 |
| The've Always Been Faster | Halo: Reach: Clear Winter Contingency without setting foot in a drivable vehicle. | 10 |
| Wake Up Buttercup | Halo: Reach: Destroy the Corvette's engines & escort in under 3 minutes during Long Night of Solace. | 10 |
| Two Corpses In One Grave | Halo: Reach: Kill 2 vehicles at once with the Target Locator during ONI: Sword Base. | 10 |
| Your Heresy Will Stay Your Feet | Halo: Reach: Kill the Elite Zealot before he can escape during Tip of the Spear. | 10 |
| I Didn't Train To Be A Pilot | Halo: Reach: Kill 3 of the anti-aircraft batteries during New Alexandria. | 10 |
| Tank Beats Everything | Halo: Reach: Finish The Package on Legendary with the Scorpion intact. | 10 |
| Swift and Shallow | Halo: Reach: Hijack a Banshee during the Reach Campaign. | 10 |
| Classic Completion | Halo: Reach: Complete Exodus without using any armor abilities. | 10 |
| T'vaoan Terminator | Halo: Reach: Kill 100 Skirmishers. | 10 |
| Chol Von's Not Gonna Like This | Halo: Reach: Kill 1000 Skirmishers. | 10 |
| Because It Wasn't Hard Enough | Halo: Reach: Complete a Legendary campaign mission with 3 or more skulls enabled (Scoring Only). | 20 |
| Game Breaker | Halo: Reach: Kill 10 enemies while using a Jetpack. | 10 |
| Run and Gunned | Halo: Reach: Headshot 10 enemies while they are sprinting. | 10 |
| Requiescat in Pace | Halo: Reach: Complete 10 assassinations on enemy players. | 10 |
| Capacious Cartography | Halo: Reach: Create a custom map using Forge World. | 10 |
| Negative, Ghostrider | Halo: Reach: Get a Skullamanjaro in a matchmade Headhunter game. | 10 |
| Workers' Compensation | Halo: Reach: Splatter an enemy using the forklift. | 10 |
| Left Behind | Halo: Reach: Achieve a score of 30,000 points on Lone Wolf. | 10 |
| One Final Firefight | Halo: Reach: Achieve a score of 150,000 points on Lone Wolf. | 20 |
| Skunked | Halo: Reach: Won a matchmade game of Invasion in the 1st phase. | 10 |