Complete the following achievements to unlock Xbox Live Gamerscore points.
Achievement | How to unlock
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| - Earn all Gold stars in all operation missions.
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| - 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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| - 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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- Extermination (30 points)
| - Kill 10,000 enemies in co-op.
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| - Complete all co-op missions.
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| - 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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| - Earn all co-op medals at least once.
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| - 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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| - Earn your first Gold star in an operation mission.
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| - Earn a star of any type in an operation mission.
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| - Destroy all Mega Turrets with the Grizzly tank in Operation F, Mission 2.
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| - Complete any mission with the maximum number of Skulls active.
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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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