Complete any level with at least three skulls active on Heroic difficulty or higher.
- What have we here?
Read a terminal.
- Heavy Reading
Read half the terminals hidden throughout the campaign.
- Dear Diary...
Read all of the terminals hidden throughout the campaign.
- Looks like the Oddball
Find your first campaign skull.
- Skulls Taken!
Locate half of the skulls hidden throughout the campaign.
Locate all the skulls hidden throughout the campaign.
- Birth of a Spartan
Complete every level of the game on Normal difficulty.
- Believe in a Hero
Complete every level of the game on Heroic difficulty.
- Living Legend
Complete every level of the game on Legendary difficulty.
- Standard Operating Brocedure
Complete any level on Normal difficulty cooperatively.
Complete any level on Heroic difficulty cooperatively.
- Bro Hammer
Complete any level on Legendary difficulty cooperatively.
- He’s Unstoppable!
Complete any level on Heroic difficulty or higher without taking health damage.
- Overshields are for Sissies
Complete the level “Pillar of Autumn” on Legendary without picking up an Overshield.
- Walk it Off
Complete the level “Pillar of Autumn” on Legendary without picking up a health kit.
- No-Fly Zone
Destroy three of the four Banshees on “Halo” on any difficulty during a single play-through.
- How Pedestrian
Complete the level “Halo” on any difficulty without entering a vehicle.
- Close Quarters Combat
Complete the level “Truth and Reconciliation” with at least four rounds left in your Sniper Rifle.
- I’ll Be Taking That!
Pilot a Banshee on the level “Assault on the Control Room.”
- This One's for Jenkins!
Kill 50 Flood Combat Forms on the level “343 Guilty Spark” on Heroic difficulty or higher.
- That Just Happened
Complete the level “The Library” on Heroic difficulty or higher without dying.
- Speed Reader
Complete the level “The Library” on Legendary difficulty in 30 minutes or less.
- Look Out for the Little Guys
Complete the level “Two Betrayals” on Heroic difficulty or higher without killing any Grunts.
- Leave It Where It Lay
Complete the level “Two Betrayals” on Legendary difficulty without picking up a new weapon.
Kill 100 Flood Infection Forms on the level “Keyes” on Heroic difficulty or above.
- All According to Plan...
Kill all the enemies in the first encounter of “Truth and Reconciliation” without being detected.
Storm the beach of “The Silent Cartographer” with no marine casualties on Heroic or Legendary.
Escape the map room in “The Silent Cartographer” without firing a shot on Heroic or Legendary.
- Wraith Hunter
Destroy four Wraith tanks in “Assault on the Control Room” with the Scorpion tank, in a single play.
- Breaking Quarantine
Escape the Forerunner facility on the level “343 Guilty Spark” in 21 minutes or less.
- Tying Up Loose Ends
Kill every Elite on the level “Keyes” on Heroic difficulty or above.
- This Side Up
Complete the Warthog ride on the level “The Maw” without being forcibly ejected from your vehicle.
- Never Tell Me the Odds
Escape “The Maw” on Legendary with at least a minute left on the count down.