Easy "Pension Plan" Achievemen...
	Easy "Prodigy" Achievement...
	Various Achievements...

This is naturally earned as you get a "Gold" rank on all levels to progress to a 100% game completion. You do not need to get 25,000 experience points to appear on the counter. The experience points spent to purchase power-ups and weapons will still qualify.

Use a turret on a map with plenty of enemies. By doing this, you will have a longer vision range, do more damage, and allow the turret to take damage instead of you. You have to shoot quickly and accurately to keep the killstreak incrementing to get the medals. Make sure the turret does not overheat to prevent being locked out from using it. You can also purchase a score booster at the start of the map. Note: This can also be done with vehicles.

Complete the following achievements to unlock Xbox Live Gamerscore points.

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