| Achievement | How to unlock
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|---|
| 117 (40 points) | Earn all Gold stars in all operation missions.
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| Archeology (20 points) | Complete Operation F.
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| Brute Force (20 points) | Finish the objectives using only the Brute Shot, melee and grenades in Operation D, Mission 1.
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| Distinguished Service (30 points) | Earn all medals in the game at least once.
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| Dynamic Duo (60 points) | Earn all Gold stars in all co-op missions.
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| Escort Service (20 points) | Keep all Wolverines intact in Operation A, Mission 3.
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| Evacuated (20 points) | Complete Operation D.
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| Extermination (60 points) | Kill 10,000 enemies in co-op.
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| Extra Credit (20 points) | Complete 75 challenges.
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| Flooded (60 points) | Complete all co-op missions.
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| Foot Soldier (20 points) | Finish the objective without using any vehicles/turrets in Operation E, Mission 4.
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| Immune (100 points) | Finish a co-op mission without becoming infected.
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| Never Knew What Hit Them (20 points) | Kill a convoy target with every stationary gun in Operation C, Mission 3.
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| Nowhere to Hide (20 points) | Prevent all Jackals from regenerating their shield in Operation B, Mission 3.
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| Overachiever (100 points) | Earn all co-op medals at least once.
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| Overrun (20 points) | Complete Operation A.
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| Pension Plan (20 points) | Earn 25000 Spartan Points throughout your career.
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| Powered by MJOLNIR (20 points) | Use every ability at least once (excluding Overshield and Seeker Drone).
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| Prodigy (20 points) | Earn your first Gold star in an operation mission.
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| Recruit (20 points) | Earn a star of any type in an operation mission.
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| Silvertip (20 points) | Destroy all Mega Turrets with the Grizzly tank in Operation F, Mission 2.
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| Skull Combo (20 points) | Complete any mission with the maximum number of Skulls active.
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| Switched Off (20 points) | Complete Operation C.
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| Switched On (20 points) | Complete Operation B.
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| Terminated (20 points) | Complete Operation E.
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| The Company of Strangers (20 points) | Complete a co-op mission with at least 5 different players.
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| The Enemy of my Friend (100 points) | Get a higher individual score than your partner on all co-op missions.
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| Vidmaster Challenge (30 points) | Complete Operation 5, Mission 1 with the Hollow and Black Eye Skulls active.
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| Vidmaster Challenge 2.0 (30 points) | Complete Operation F, Mission 4 with the Blind and Thunderstorm Skulls active.
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| Weapon of Choice (10 points) | Score a kill with every handheld weapon (excluding Rocket Launcher and Spartan Laser).
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