Complete the Master Chief Saga playlist.
Kill 100 enemies or players.
Kill 100 Grunts.
Kill 100 Elites.
Kill 100 Jackals.
Kill 100 Brutes.
Kill 50 Hunters.
Kill 100 Watchers.
Kill 100 Knights.
Kill 100 Crawlers.
Kill 20,000 enemies or players.
Collect 10,000 campaign or playlist medals.
Get killed by the Guardians.
Kill a 343 developer in matchmaking or someone who has this achievement.
Inscrutable. Mysterious.
Complete 10 missions or multiplayer games.
Complete 100 missions or multiplayer games.
Win 10 multiplayer games.
Win 100 multiplayer games.
Complete three cross-game playlists.
Complete one cross-game playlist.
Play a multiplayer or co-op game at least 3 months after your first game.
Complete all campaigns on Normal difficulty.
Complete all campaigns on Heroic difficulty.
Complete all campaigns on Legendary difficulty.
Activate all terminals.
Complete a campaign mission or a match of multiplayer.
Complete the LASO playlist for every Halo game.
Halo CE: Complete The Silent Cartographer.
Halo CE: Complete Assault on the Control Room.
Halo CE: Complete The Pillar of Autumn.
Halo CE: Complete Halo.
Halo CE: Complete The Truth and Reconciliation.
Halo CE: Complete 343 Guilty Spark.
Halo CE: Complete The Library.
Halo CE: Complete Two Betrayals.
Halo CE: Complete Keyes.
Halo CE: Complete The Maw.
Halo CE: Beat the par time on The Silent Cartographer.
Halo CE: Beat the par time on Assault on the Control Room.
Halo CE: Beat the par time on The Pillar of Autumn.
Halo CE: Beat the par time on Halo.
Halo CE: Beat the par time on The Truth and Reconciliation.
Halo CE: Beat the par time on 343 Guilty Spark.
Halo CE: Beat the par time on The Library.
Halo CE: Beat the par time on Two Betrayals.
Halo CE: Beat the par time on Keyes.
Halo CE: Beat the par time on The Maw.
Halo CE: Beat par time on all Halo: CE levels.
Halo CE: Beat the par score on The Silent Cartographer.
Halo CE: Beat the par score on Assault on the Control Room.
Halo CE: Beat the par score on The Pillar of Autumn.
Halo CE: Beat the par score on Halo.
Halo CE: Beat the par score on The Truth and Reconciliation.
Halo CE: Beat the par score on 343 Guilty Spark.
Halo CE: Beat the par score on The Library.
Halo CE: Beat the par score on Two Betrayals.
Halo CE: Beat the par score on Keyes.
Halo CE: Beat the par score on The Maw.
Halo CE: Beat the par score on all Halo: CE levels.
Halo CE: Activate Terminal 1 on The Pillar of Autumn.
Halo CE: Activate Terminal 2 on Halo.
Halo CE: Activate Terminal 3 on The Truth and Reconciliation.
Halo CE: Activate Terminal 4 on The Silent Cartographer.
Halo CE: Activate Terminal 5 on Assault on the Control Room.
Halo CE: Activate Terminal 6 on 343 Guilty Spark.
Halo CE: Activate Terminal 7 on The Library.
Halo CE: Activate Terminal 8 on Two Betrayals.
Halo CE: Activate Terminal 9 on Keyes.
Halo CE: Activate Terminal 10 on The Maw.
Halo CE: Activate all Halo: CE Terminals.
Halo CE: Find and claim the Iron skull in remastered mode.
Halo CE: Find and claim the Mythic skull in remastered mode.
Halo CE: Find and claim the Boom skull in remastered mode.
Halo CE: Find and claim the Foreign skull in remastered mode.
Halo CE: Find and claim the Famine skull in remastered mode.
Halo CE: Find and claim the Bandanna skull in remastered mode.
Halo CE: Find and claim the Fog skull in remastered mode.
Halo CE: Find and claim the Malfunction skull in remastered mode.
Halo CE: Find and claim the Recession skull in remastered mode.
Halo CE: Find and claim the Black Eye skull in remastered mode.
Halo CE: Find and claim the Eye Patch skull in remastered mode.
Halo CE: Find and claim the Pinata skull in remastered mode.
Halo CE: Find and claim the Grunt Birthday Party skull in remastered mode.
Halo CE: Find and claim all Skulls in Halo: CE.
Halo CE: Complete every level of the game on Normal difficulty.
Halo CE: Complete every level of the game on Heroic difficulty.
Halo CE: Complete every level of the game on Legendary difficulty.
Halo CE: Complete the level The Pillar of Autumn on Legendary without picking up an overshield.
Halo CE: Complete The Pillar of Autumn on Legendary without picking up a health kit.
Halo CE: Complete Halo without entering a vehicle.
Halo CE: Complete The Library on Heroic or Legendary difficulty without dying.
Halo CE: Complete Two Betrayals on Legendary difficulty without killing any Grunts.
Halo CE: Complete Two Betrayals on Legendary difficulty without picking up a new weapon.
Halo CE: Kill every Elite on the level Keyes on Heroic or Legendary difficulty.
Halo CE: Complete a Halo: CE playlist.
Halo CE: Complete three Halo: CE playlists.
Halo CE: Complete the Halo: CE LASO Campaign playlist.
Halo CE: Kill a Hunter with one pistol round.
Halo CE: Trigger a hidden music cue in Halo: CE.
Halo CE: Fight alongside Chips Dubbo and listen to his words of wisdom.
Halo CE: Disapprovingly look at Captain Keyes' abandoned pipe.
Halo CE: Find the hidden Rex sign on The Maw.
Halo CE: Listen to the Thirsty Grunt talk about his eating habits.
Halo CE: It's a sign.
Halo CE: Ride in a Pelican for several seconds on the level 343 Guilty Spark.
Halo CE: Complete a level without jumping.
Halo CE: Complete every level of the game having seen it in both classic and remastered mode.
Complete any co-op level on Normal difficulty.
Complete any co-op level on Heroic difficulty.
Halo CE: Complete any level on Heroic difficulty or higher without taking health damage.
Collect 9,000 campaign or playlist medals.
Halo CE: Play Halo: CE on the 15th of any month.
Halo CE: Halo CE: Complete all Halo: CE Legendary campaign missions in under 3 hours.
Halo 2: Complete Cairo Station.
Halo 2: Complete Outskirts.
Halo 2: Complete Metropolis.
Halo 2: Complete The Arbiter.
Halo 2: Complete The Oracle.
Halo 2: Complete Delta Halo.
Halo 2: Complete Regret.
Halo 2: Complete Sacred Icon.
Halo 2: Complete Quarantine Zone.
Halo 2: Complete Gravemind.
Halo 2: Complete Uprising.
Halo 2: Complete High Charity.
Halo 2: Complete The Great Journey.
Halo 2: Beat the par time on Cairo Station.
Halo 2: Beat the par time on Outskirts.
Halo 2: Beat the par time on Metropolis.
Halo 2: Beat the par time on The Arbiter.
Halo 2: Beat the par time on The Oracle.
Halo 2: Beat the par time on Delta Halo.
Halo 2: Beat the par time on Regret.
Halo 2: Beat the par time on Sacred Icon.
Halo 2: Beat the par time on Quarantine Zone.
Halo 2: Beat the par time on Gravemind.
Halo 2: Beat the par time on Uprising.
Halo 2: Beat the par time on High Charity.
Halo 2: Beat the par time on The Great Journey.
Halo 2: Beat par time on all Halo 2 levels.
Halo 2: Beat the par score on Cairo Station.
Halo 2: Beat the par score on Outskirts.
Halo 2: Beat the par score on Metropolis.
Halo 2: Beat the par score on The Arbiter.
Halo 2: Beat the par score on The Oracle.
Halo 2: Beat the par score on Delta Halo.
Halo 2: Beat the par score on Regret.
Halo 2: Beat the par score on Sacred Icon.
Halo 2: Beat the par score on Quarantine Zone.
Halo 2: Beat the par score on Gravemind.
Halo 2: Beat the par score on Uprising.
Halo 2: Beat the par score on High Charity.
Halo 2: Beat the par score on The Great Journey.
Halo 2: Beat the par score on every Halo 2 level.
Halo 2: Activate Terminal 1 on Cairo Station.
Halo 2: Activate Terminal 2 on Outskirts.
Halo 2: Activate Terminal 3 on Metropolis.
Halo 2: Activate Terminal 4 on The Arbiter.
Halo 2: Activate Terminal 5 on The Oracle.
Halo 2: Activate Terminal 6 on Delta Halo.
Halo 2: Activate Terminal 7 on Regret.
Halo 2: Activate Terminal 8 on Sacred Icon.
Halo 2: Activate Terminal 9 on Quarantine Zone.
Halo 2: Activate Terminal 10 on Gravemind.
Halo 2: Activate Terminal 11 on Uprising.
Halo 2: Activate Terminal 12 on High Charity.
Halo 2: Activate Terminal 13 on The Great Journey.
Halo 2: Activate all Halo 2 Terminals.
Halo 2: Find and claim the That's Just...Wrong Skull.
Halo 2: Find and claim the Thunderstorm Skull on Legendary.
Halo 2: Find and claim the Blind Skull.
Halo 2: Find and claim the IWHBYD Skull on Legendary.
Halo 2: Find and claim the Catch Skull on Legendary.
Halo 2: Find and claim the Grunt Birthday Party Skull on Legendary.
Halo 2: Find and claim the Famine Skull on Legendary.
Halo 2: Find and claim the Envy Skull on Legendary.
Halo 2: Find and claim the Assassins Skull on Legendary.
Halo 2: Find and claim the Mythic Skull on Legendary.
Halo 2: Find and claim the Sputnik Skull on Legendary.
Halo 2: Find and claim the Anger Skull on Legendary.
Halo 2: Find and claim the Ghost Skull on Legendary.
Halo 2: Find and claim the Iron Skull on Legendary.
Halo 2: Find and claim the Black Eye Skull on Legendary.
Halo 2: Find and claim all Skulls in Halo 2.
Halo 2: Collect the Master Chief toy in Delta Halo.
Halo 2: Collect the Prophet of Regret toy in Regret.
Halo 2: Collect the Arbiter toy in Sacred Icon.
Halo 2: Collect the Tartarus toy in Quarantine Zone.
Halo 2: Collect the Cortana toy in Gravemind.
Halo 2: Collect the Librarian toy in Uprising.
Halo 2: Collect the Rampant Cortana toy in High Charity.
Halo 2: Collect the Didact toy in The Great Journey.
Halo 2: Collect all eight Halo toys.
Halo 2: Complete every level of the game on Normal difficulty.
Halo 2: Complete every level of the game on Heroic difficulty.
Halo 2: Complete every level of the game on Legendary difficulty.
Halo 2: Complete a Halo 2 playlist.
Halo 2: Complete three Halo 2 playlists.
Halo 2: Drive a Scorpion while playing as the Arbiter.