| Achievement | How to unlock
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| 117 (20 points) | Earn all Gold stars in all operation missions.
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| Archeology (10 points) | Complete Operation F.
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| Brute Force (10 points) | Finish the objectives using only the Brute Shot, melee and grenades in Operation D, Mission 1.
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| Distinguished Service (15 points) | Earn all medals in the game at least once.
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| Dynamic Duo (30 points) | Earn all Gold stars in all co-op missions.
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| Escort Service (10 points) | Keep all Wolverines intact in Operation A, Mission 3.
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| Evacuated (10 points) | Complete Operation D.
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| Extermination (30 points) | Kill 10,000 enemies in co-op.
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| Extra Credit (10 points) | Complete 75 challenges.
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| Flooded (30 points) | Complete all co-op missions.
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| Foot Soldier (10 points) | Finish the objective without using any vehicles/turrets in Operation E, Mission 4.
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| Never Knew What Hit Them (10 points) | Kill a convoy target with every stationary gun in Operation C, Mission 3.
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| Nowhere to Hide (10 points) | Prevent all Jackals from regenerating their shield in Operation B, Mission 3.
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| Overachiever (50 points) | Earn all co-op medals at least once.
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| Overrun (10 points) | Complete Operation A.
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| Pension Plan (10 points) | Earn 25000 Spartan Points throughout your career .
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| Powered by MJOLNIR (10 points) | Use every ability at least once (excluding Overshield and Seeker Drone).
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| Prodigy (10 points) | Earn your first Gold star in an operation mission.
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| Recruit (10 points) | Earn a star of any type in an operation mission.
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| Silvertip (10 points) | Destroy all Mega Turrets with the Grizzly tank in Operation F, Mission 2.
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| Skull Combo (10 points) | Complete any mission with the maximum number of Skulls active.
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| Switched Off (10 points) | Complete Operation C.
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| Switched On (10 points) | Complete Operation B.
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| Terminated (10 points) | Complete Operation E.
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| The Company of Strangers (10 points) | Complete a co-op mission with at least 5 different players.
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| Vidmaster Challenge (15 points) | Complete Operation 5, Mission 1 with the Hollow and Black Eye Skulls active.
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| Vidmaster Challenge 2.0 (15 points) | Complete Operation F, Mission 4 with the Blind and Thunderstorm Skulls active.
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| Weapon of Choice (5 points) | Score a kill with every handheld weapon (excluding Rocket Launcher and Spartan Laser).
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