Halo 3: Beat the par score on Crow's Nest.
H3: ODST: Beat the par time on Coastal Highway.
H3: ODST: Beat the par score on Tayari Plaza.
Halo 4: Complete a Spartan Ops mission.
Complete 300 missions or multiplayer games.
Collect 3,000 campaign or playlist medals.
Complete any co-op level on Legendary difficulty.
Complete 150 missions or multiplayer games.
Halo CE: Complete The Library on Heroic or Legendary difficulty without dying.