Collect 6,000 campaign or playlist medals.
Halo 3: Beat the par time on Sierra 117.
Collect 3,000 campaign or playlist medals.
Halo CE: Find and claim the Malfunction skull in remastered mode.
Halo CE: Complete The Library on Heroic or Legendary difficulty without dying.
Halo 2: Complete the level Regret with the Prophet Birthday Skull activated.