| Landfall | Finish the first mission on any difficulty above Easy. | 20 |
| Holdout | Finish the second mission on any difficulty above Easy. | 20 |
| The Road | Finish the third mission on any difficulty above Easy. | 20 |
| Assault | Finish the fourth mission on any difficulty above Easy. | 30 |
| Cleansing | Finish the fifth mission on any difficulty above Easy. | 30 |
| Refuge | Finish the sixth mission on any difficulty above Easy. | 30 |
| Last Stand | Finish the seventh mission on any difficulty above Easy. | 40 |
| The Key | Finish the eighth mission on any difficulty above Easy. | 40 |
| Return | Finish the ninth mission on any difficulty above Easy. | 50 |
| Campaign Complete: Normal | Finish the campaign on Normal, Heroic, or Legendary. | 125 |
| Campaign Complete: Heroic | Finish the campaign on Legendary or Heroic. | 125 |
| Campaign Complete: Legendary | Finish the campaign on Legendary. | 125 |
| Iron | Find the skull on Normal, Heroic, or Legendary difficulty. | 10 |
| Black Eye | Find the skull on Normal, Heroic, or Legendary difficulty. | 10 |
| Tough Luck | Find the skull on Normal, Heroic, or Legendary difficulty. | 10 |
| Catch | Find the skull on Normal, Heroic, or Legendary difficulty. | 10 |
| Fog | Find the skull on Normal, Heroic, or Legendary difficulty. | 10 |
| Famine | Find the skull on Normal, Heroic, or Legendary difficulty. | 10 |
| Thunderstorm | Find the skull on Normal, Heroic, or Legendary difficulty. | 10 |
| Tilt | Find the skull on Normal, Heroic, or Legendary difficulty. | 10 |
| Mythic | Find the skull on Normal, Heroic, or Legendary difficulty. | 10 |
| Graduate | Earn 5 EXP or finish 10 games to complete basic training in online play. | 10 |
| Guerilla | Earn 15,000 points in Campaign Scoring mode on the first mission. | 10 |
| Demon | Earn 15,000 points in Campaign Scoring mode on the second mission. | 10 |
| Cavalier | Earn 15,000 points in Campaign Scoring mode on the third mission. | 10 |
| Askar | Earn 15,000 points in Campaign Scoring mode on the fourth mission. | 10 |
| Exterminator | Earn 15,000 points in Campaign Scoring mode on the fifth mission. | 10 |
| Ranger | Earn 50,000 points in Campaign Scoring mode on the sixth mission. | 10 |
| Vanguard | Earn 50,000 points in Campaign Scoring mode on the seventh mission. | 10 |
| Orpheus | Earn 15,000 points in Campaign Scoring mode on the eighth mission. | 10 |
| Reclaimer | Earn 15,000 points in Campaign Scoring mode on the ninth mission. | 10 |
| UNSC Spartan | Earn a Sergeant rating in online play. | 15 |
| Spartan Officer | Become an Officer in online play. | 25 |
| Two For One | Kill two enemies with one Spartan Laser shot in a ranked free for all online playlist. | 5 |
| Too Close To The Sun | Kill a Banshee with the Spartan Laser or missile pod in the campaign or ranked online play. This can be done in the same area as the first anti-air Wraith in the Storm level of the campaign. | 5 |
| Triple Kill | Kill three enemies within four seconds of one another in ranked free for all online play. | 5 |
| Overkill | Kill four enemies within four seconds of one another in ranked free for all online play. | 5 |
| Lee R Wilson Memorial | Get five grenade sticks in ranked free for all online play. | 5 |
| We're In For Some Chop | Destroy an enemy vehicle with equipment in a ranked playlist or in the campaign. Your best bet is to use a trip mine, probably. | 5 |
| Killing Frenzy | Kill 10 enemies without dying in ranked free for all play. | 5 |
| Steppin' Razor | Score a Triple Kill with the energy sword in ranked free for all play. | 5 |
| Mongoose Mowdown | Kill an enemy with the Mongoose by running them over in ranked free for all play. | 5 |
| Up Close and Personal | Kill five enemies by melee or assassination in ranked free for all play. | 5 |
| Fear the Pink Mist | Kill five enemies with the needler in ranked free for all play or during the campaign. You'll earn this early on if you play through the campaign missions. | 5 |
| Headshot Honcho | Kill 10 enemies with headshots in ranked free for all play or in the campaign. | 5 |
| Used Car Salesman | Destroy a vehicle with three enemies in it in ranked online play or in the campaign. | 5 |
| Marathon Man | Locate and use all the Terminals in the campaign. | 40 |
| MVP | Earn the MVP award in ranked online play. | 5 |
| Maybe Next Time Buddy | After being boarded in free for all online play, board the same vehicle again within 10 seconds. | 5 |
