Complete the following achievements to unlock Microsoft Gamerscore points.
| Achievement | How to unlock |
| Air Traffic Control (20 points) | Blow up the Banshee in flight while manned, with grenades or the rocket launcher.
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| Assassin (10 points) | Melee an opponent from behind.
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| Bonecracker (10 points) | Hit and kill an opponent with a melee attack.
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| Cairo Station (30 points) | Complete Cairo Station at Normal, Heroic, or Legendary.
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| Carjacking (5 points) | Steal an occupied vehicle from an opponent and take it over.
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| Counterpoint (5 points) | Kill the sword carrier.
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| Decorated Soldier (10 points) | Get awarded at least 8 different medals in one non-team game.
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| Delta Halo (30 points) | Complete Delta Halo at Normal, Heroic, or Legendary.
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| Demon (25 points) | Complete any campaign level without dying once on Normal, Heroic, or Legendary.
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| Double Kill (20 points) | Kill 2 opponents within 4 seconds.
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| Flaming Ninja (20 points) | Kill an opponent that has the Ninja achievement.
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| Go Ape Shiv (20 points) | Kill an enraged, berserk Brute by melee, any level, any difficulty.
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| Gravemind (30 points) | Complete Gravemind at Normal, Heroic, or Legendary.
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| Hero (50 points) | Complete the game on Heroic difficulty.
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| High Charity (30 points) | Complete High Charity at Normal, Heroic, or Legendary.
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| Hired Gun (20 points) | Kill an opponent who has the Legend achievement.
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| Killing Spree (20 points) | Kill 5 opponents in a row in the same game, without dying.
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| Killtacular (20 points) | Kill 4 opponents within 4 seconds.
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| King of the Scarab (20 points) | Acquire the Scarab gun on the Metropolis level, any difficulty.
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| Legend (50 points) | Complete the game on Legendary difficulty.
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| Metropolis (30 points) | Complete Metropolis at Normal, Heroic, or Legendary.
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| Ninja (20 points) | In a non-team game, kill 5 people by melee, from behind.
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| Oracle (30 points) | Complete The Oracle at Normal, Heroic, or Legendary.
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| Outskirts (30 points) | Complete Outskirts at Normal, Heroic, or Legendary.
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| Quarantine Zone (30 points) | Complete Quarantine Zone at Normal, Heroic, or Legendary.
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| Rainman (25 points) | Play every available game variant, with at least 3 other players, to the end of each game.
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| Regret (30 points) | Complete Regret at Normal, Heroic, or Legendary.
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| Roadkill (10 points) | Run over, hit and kill an opponent with a vehicle.
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| Running Riot (20 points) | Kill 10 opponents in a row in the same game, without dying.
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| Sacred Icon (30 points) | Complete Sacred Icon at Normal, Heroic, or Legendary.
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| Silent but Deadly (20 points) | Kill 7 opponents from behind in a row without being spotted, any level, any difficulty.
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| Skewer Stopper (20 points) | Kill the sword carrier after they kill 5 or more times in a row with the sword.
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| Sniper Kill (10 points) | Kill an opponent with the sniper rifle or the beam rifle.
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| Stick It (5 points) | Stick an opponent with a plasma grenade and blow them up.
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| The Great Journey (30 points) | Complete The Great Journey at Normal, Heroic, or Legendary.
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| Triple Kill (20 points) | Kill 3 opponents within 4 seconds.
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| The Arbiter (30 points) | Complete The Arbiter at Normal, Heroic, or Legendary.
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| Uprising (30 points) | Complete Uprising at Normal, Heroic, or Legendary.
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| Vigilante (10 points) | Stop a Killing Spree of another player.
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| Violent Cartographer (25 points) | Play every available default map and stay in each game until it's over.
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| Warrior (100 points) | Complete the game on Normal difficulty.
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