Complete Operation A
Finish the objective without using any vehicles/turrets in Operation E, Mission 4
Earn a star of any type
Earn your first Gold star
Earn all Gold stars
Earn 25000 XP throughout your career
Earn all medals in the game at least once
Score a kill with every handheld weapon (excluding Rocket Launcher and Spartan Laser)
Use every armor ability at least once (excluding Overshield and Seeker Drone)
Complete any mission with the maximum number of Skulls active
Complete Operation E, Mission 1 with the Hollow and Black Eye Skulls active
Complete Operation B
Complete 75 mission specific challenges
Complete Operation F
Destroy all Mega Turrets with the Grizzly tank in Operation F, Mission 2
Complete Operation C
Earn all Gold stars in Operation F
Complete Operation F, Mission 4 with the Blind and Thunderstorm Skulls active
Complete all Operation F mission challenges
Complete Operation D
Complete Operation E
Keep all Wolverines intact in Operation A, Mission 3
Prevent all Jackals from regenerating their shields in Operation B, Mission 3
Kill a convoy target with every stationary gun in Operation C, Mission 3
Finish the objectives using only the Brute Shot, melee and grenades in Operation D, Mission 1
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