Tsantsa
Complete any level with at least three skulls active on Heroic difficulty or higher.
50 
Dear Diary...
Read all of the terminals hidden throughout the campaign.
50 
Headhunter
Locate all the skulls hidden throughout the campaign.
50 
Living Legend
Complete every level of the game on Legendary difficulty.
50 
Bro Hammer
Complete any level on Legendary difficulty cooperatively.
50 
The Silent Cartographer
Complete the level “The Silent Cartographer” on any difficulty.
25 
Assault on the Control Room
Complete the level “Assault on the Control Room” on any difficulty.
25 
Pillar of Autumn
Complete the level “Pillar of Autumn” on any difficulty.
25 
Halo
Complete the level “Halo” on any difficulty.
25 
Truth and Reconciliation
Complete the level “Truth and Reconciliation” on any difficulty.
25 
343 Guilty Spark
Complete the level “343 Guilty Spark” on any difficulty.
25 
The Library
Complete the level “The Library” on any difficulty.
25 
Two Betrayals
Complete the level “Two Betrayals” on any difficulty.
25 
Keyes
Complete the level “Keyes” on any difficulty.
25 
The Maw
Complete the level “The Maw” on any difficulty.
25 
Heavy Reading
Read half the terminals hidden throughout the campaign.
25 
Skulls Taken!
Locate half of the skulls hidden throughout the campaign.
25 
Walk it Off
Complete the level “Pillar of Autumn” on Legendary without picking up a health kit.
25 
How Pedestrian
Complete the level “Halo” on any difficulty without entering a vehicle.
25 
Close Quarters Combat
Complete the level “Truth and Reconciliation” with at least four rounds left in your Sniper Rifle.
25 
I’ll Be Taking That!
Pilot a Banshee on the level “Assault on the Control Room.”
25 
Speed Reader
Complete the level “The Library” on Legendary difficulty in 30 minutes or less.
25 
Leave It Where It Lay
Complete the level “Two Betrayals” on Legendary difficulty without picking up a new weapon.
25 
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Kill 100 Flood Infection Forms on the level “Keyes” on Heroic difficulty or above.
25 
Grenadier
Escape the map room in “The Silent Cartographer” without firing a shot on Heroic or Legendary.
25 
Breaking Quarantine
Escape the Forerunner facility on the level “343 Guilty Spark” in 21 minutes or less.
25 
Never Tell Me the Odds
Escape “The Maw” on Legendary with at least a minute left on the count down.
25 
Believe in a Hero
Complete every level of the game on Heroic difficulty.
20 
Brovershield
Complete any level on Heroic difficulty cooperatively.
20 
He’s Unstoppable!
Complete any level on Heroic difficulty or higher without taking health damage.
20 
What have we here?
Read a terminal.
10 
Looks like the Oddball
Find your first campaign skull.
10 
Birth of a Spartan
Complete every level of the game on Normal difficulty.
10 
Standard Operating Brocedure
Complete any level on Normal difficulty cooperatively.
10 
Overshields are for Sissies
Complete the level “Pillar of Autumn” on Legendary without picking up an Overshield.
10 
No-Fly Zone
Destroy three of the four Banshees on “Halo” on any difficulty during a single play-through.
10 
This One's for Jenkins!
Kill 50 Flood Combat Forms on the level “343 Guilty Spark” on Heroic difficulty or higher.
10 
That Just Happened
Complete the level “The Library” on Heroic difficulty or higher without dying.
10 
Look Out for the Little Guys
Complete the level “Two Betrayals” on Heroic difficulty or higher without killing any Grunts.
10 
All According to Plan...
Kill all the enemies in the first encounter of “Truth and Reconciliation” without being detected.
10 
Beachhead
Storm the beach of “The Silent Cartographer” with no marine casualties on Heroic or Legendary.
10 
Wraith Hunter
Destroy four Wraith tanks in “Assault on the Control Room” with the Scorpion tank, in a single play.
10 
Tying Up Loose Ends
Kill every Elite on the level “Keyes” on Heroic difficulty or above.
10 
This Side Up
Complete the Warthog ride on the level “The Maw” without being forcibly ejected from your vehicle.
10