| Unlockable: | How to Unlock: |
| 2 Bugs are Better Than 1 (10 GP) | Win a Skirmish Game with Dual Scarabs. |
| 24 Hours of Quality (20 GP) | Play Halo Wars for at least 24 Total Hours. |
| Adjudicate the Arbiter (30 GP) | Complete the Campaign on Heroic Difficulty. |
| Alas, Poor Andrew Thomas (5 GP) | Collect your first Skull. |
| Backscratcher (10 GP) | Complete any Campaign Mission in Co-op Mode. |
| Basically Naive (10 GP) | Obtain the Recruit Rank on Xbox LIVE. |
| Battened Down the Hatches (5 GP) | Mission 11: Save all the Airlocks. |
| Beaming with Pride (5 GP) | Mission 13: Destroy 25 units with the Scarab. |
| Big Al's Scooter (10 GP) | Win a Heroic Skirmish Game against the AI in under 10 minutes. |
| Covenant "Hot Drop" (5 GP) | Mission 3: Kill at least 5 Covenant Units with the Bridge. |
| Crushed Colors (10 GP) | Improve your Score in any Campaign Mission. |
| Detour the Great Journey (50 GP) | Complete the Campaign on Legendary Difficulty. |
| Didn't Get To Second Base (5 GP) | Mission 14: Don't claim an extra base. |
| Empire Builder (5 GP) | Win a game in every Skirmish Game Mode. |
| Endless Fun (5 GP) | Mission 2: Destroy every Methane Tank. |
| Epic Grinder (40 GP) | Obtain a Lifetime Campaign Score over 1,000,000. |
| Everything's Better with Bacon (5 GP) | Mission 1: Ram 50 Grunts with Warthogs. |
| Gallivant around the Galaxy (25 GP) | Win a game on every Skirmish Map. |
| Graverobber (30 GP) | Collect all Skulls. |
| Halo Academic (15 GP) | Unlock 20 Timeline Events. |
| Halo Historian (40 GP) | Unlock All Timeline Events. |
| Handy with Tools (5 GP) | Mission 12: Repair the Power Core in less than 4 minutes. |
| He's Got The Jack (5 GP) | Mission 5: Jack 6 Covenant Vehicles. |
| Micro Manager (5 GP) | Mission 7: Do not destroy any Power Node. |
| Momma's Boy (5 GP) | Get a Gold Medal on any mission. |
| Mr. Punctual (15 GP) | Finish all missions under Par Time on Heroic difficulty . |
| My Virtual Friends Love Me (10 GP) | Win a 3v3 Skirmish game with 2 AI Allies. |
| N00b n0 M0r3 (10 GP) | Win a Matchmade Skirmish Game on Xbox LIVE. |
| Officer on Deck (30 GP) | Obtain the Lieutenant Rank on Xbox LIVE. |
| OMG BFF FTW (40 GP) | Complete entire Campaign in Co-op Mode. |
| Own Worst Enemy (20 GP) | Get a Gold Medal with all Debuff Skulls Active. |
| Penny Pincher (10 GP) | Get a winning High Score with 10 or less Squads against the Heroic AI. |
| Playin' the Field (15 GP) | Win a Skirmish Game with every Leader. |
| Ramblin' Man (5 GP) | Mission 8: Use Elephants to train 100 Infantry. |
| Ready for the Sequel (75 GP) | 100% Completion. |
| Rhino Hugger (5 GP) | Mission 6: Successfully protect every Rhino. |
| Running the Show (50 GP) | Obtain the General Rank on Xbox LIVE. |
| So Lonely at the Top (20 GP) | Win and have the Highest Score in a Matchmade Skirmish Game on Xbox LIVE. |
| Sweet Naptime (5 GP) | Mission 9: Put every Colony in Hibernation Mode at the same time. |
| The Procrastinator (5 GP) | Mission 10: Disrupt all Tractor Beams. |
| The Real Winner (5 GP) | Mission 4: Save Adam. |
| Thinkin' about My Doorbell (5 GP) | Mission 15: Open the Doors in order. |
| Titan (15 GP) | Get 20,000 points in any Skirmish Game. |
| Walk-Off Winner (30 GP) | Use one of the 6 Major Leader Powers to destroy an enemy's last unit. |
| Wall of Recognition (30 GP) | Get a Gold Medal on every Campaign Mission . |
| Unlockable: | How to Unlock: |
| Skull Name: Boomstick (Mission 12: Repairs) | Kill 12 Spirit Transports - take a Hawk to the Lower 2 Airlocks and it its right up the Little ramp in the Air |
| Skull Name: Bountiful Harvest (Mission 14: Reactor) | Kill 20 Vampires - head to the Second Covenant Base and its in the Far corner at the bottom of the next ramp |
| Skull Name: Catch (Mission 10: Shield World) | Kill 350 Swarms - get at least 2 Hornets and fly East of you base past the First Tower to a Plateau with covered with Flood Eggs it is in the center |
| Skull Name: Cowbell (Mission 3: Relic Interior) | Kill 45 Hunters - take a Grizzly, Anders, Forge and Your Marines Back to where they were held up on the central pad |
| Skull Name: Emperor (Mission 15: Escape) | Kill 3 Scarabs - Head the to Very North of the Map and its dead Center of all the flood |
| Skull Name: Fog (Mission 5: Arcadia Outskirts) | Kill 5 Wraiths - get a Warthog and rush back up the Tracks to the left of your Main Base and just keep going straight past the split in the Tracks |
| Skull Name: Grunt Birthday Party (Mission 2: Relic Approach) | Kill 20 Jackals - head back to Alpha Base with a Worthog its in the south end of the base |
| Skull Name: Look Daddy! (Mission 1: Alpha Base) | Kill 100 Grunts - get a Warthog and rush back to the front gate of Alpha base the skull is where the Marines were held up |
| Skull Name: Pain Train (Mission 13: Beachhead) | Kill 10 Bomber Forms - head back to the Beginning of the Map by the First Teleporter and head down the Path to a Flood nest and its right next to it |
| Skull Name: Rebel Leader (Mission 9: The Flood) | Kill 20 Flood Stalks - just to the North East of your Main Base is a downed Pelican. Just take a Warthog to claim it fast and easy |
| Skull Name: Rebel Supporter (Mission 8: Anders' Signal) | Kill 750 Infection Forms - head to North Side of the Map where you got the Elephant, head east towards a cliff, But you'll see a ridge. Go into ridge |
| Skull Name: Rebel Sympathizer (Mission 7: Scarab ) | Kill 10 Locusts - get a Warthog and take it to the Top Left of the Map where there was 2 Locusts and a Power Nod its right there |
| Skull Name: Sickness (Mission 6: Dome of Light) | Kill 50 Banshees - take a Squad of Marines to the Hanger Behind your Base its right there |
| Skull Name: Sugar Cookies (Mission 11: Cleansing) | Kill 100 Sentinels - take a Hornet to the front end of the Spirit Of Fire and it is right on the nose of the Ship |
| Skull Name: Wuv Woo (Mission 4: Arcadia City) | Kill 50 Elites - where you Set up Base Two in the Streets there are some stairs Next to it leading to a Bronze Statue Its next to the Statue |
| Unlockable: | How to Unlock: |
| Mission 1 (Alpha Base) | Just under the last bridge before you enter the rear gates of the Alpha Base. |
| Mission 10 (Shield World) | With Bravo platoon, in the middle of the platoon you pick up. |
| Mission 11 (Cleansing) | Towards the left-rear of the ship, on the sloped wings. A flying unit is required to retrieve it. |
| Mission 12 (Repairs) | Close to the left side of the Power Core building, just on the left edge of the Spirit of Fire. |
| Mission 13 (Beachhead) | On a ledge near the second set of teleporters that are behind the Covenant base. |
| Mission 14 (Reactor) | Up and to the left at the peak of first ramp. It is on the edge of the ramp. |
| Mission 15 (Escape) | Between the Covenant base and Flood area in the northern part of the map. It can be found directly across from your starting point. |
| Mission 2 (Relic Approach) | Enter the area through the Covenant shield with the supply crates. The Black Box is located at the top left on the map. |
| Mission 3 (Relic Interior) | The left side of the starting point, close to the Pelican crash site. This is just outside the Relic itself. |
| Mission 4 (Arcadia City) | At the base of the elevator tower near to the controls where you save Adam. |
| Mission 5 (Arcadia Outskirts) | Just off the main road behind a destroyed Pelican, just down the first ramp. |
| Mission 6 (Dome of Light) | At the far side of map, where you transported the third Rhino by Pelican. |
| Mission 7 (Scarab) | On the right side of the map, just inside a cave-like alcove that contains some supply crates. |
| Mission 8 (Anders' Signal) | On a ridge located to the right, close to the big Brute fire line at the start. |
| Mission 9 (The Flood) | Go straight out from the base ramp towards the map's opposite side. |
| Unlockable: | How to Unlock: |
| Mission 1 (Alpha Base) | Over 27,000 points within 5 to 12 minutes. |
| Mission 10 (Shield World) | Over 55,000 points within 23 to 32 minutes. |
| Mission 11 (Cleansing) | Over 30,000 points within 23 to 30minutes. |
| Mission 12 (Repairs) | Over 32,000 points within 10 to 20 minutes. |
| Mission 13 (Beachhead) | Over 40,000 points within 20 to 60 minutes. |
| Mission 14 (Reactor) | Over 30,000 points within 15 to 30 minutes. |
| Mission 15 (Escape) | Over 30,000 points within 20 to 33 minutes. |
| Mission 2 (Relic Approach) | Over 70,000 points within 15 to 30 minutes. |
| Mission 3 (Relic Interior) | Over 45,000 points within 8 to 18 minutes. |
| Mission 4 (Arcadia City) | Over 50,000 points within 21 to 23 minutes. |
| Mission 5 (Arcadia Outskirts) | Over 40,000 points within 21 to 23 minutes. |
| Mission 6 (Dome of Light) | Over 45,000 points within 15 to 30 minutes. |
| Mission 7 (Scarab) | Over 32,000 points within 12 to 24 minutes. |
| Mission 8 (Anders' Signal) | Over 30,000 points within 18 to 30 minutes. |
| Mission 9 (The Flood) | Over 35,000 points within 18 to 30 minutes. |
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