Collect 3,000 campaign or playlist medals.
Halo 3: Listen to the story of the Final Grunt.
Halo 4: Survive Spartan Miller (Ep.5 Ch.1) of Spartan Ops on Heroic or Legendary.
Halo: Reach: Complete every level of the game on Normal difficulty.
Halo 2: Complete the level Regret with the Prophet Birthday Skull activated.
Halo CE: Complete The Library on Heroic or Legendary difficulty without dying.