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Disarmed

Dismember 100 Flood parts.

Captain's Orders

Complete Keyes.

Double Trouble

Complete Two Betrayals.

Claims Adjuster

Break off 50 Vehicle parts.

Timeless Tomes

Find all skulls and terminals in The Library.

Protocol Dictates Action

Complete The Library.

Making a Necklace

Collect 22 Skulls.

This Stuff is Your History

Complete 343 Guilty Spark.

Proto Gravemind

Find all skulls and terminals in 343 Guilty Spark.

Cranial

Collect a Skull.

Clean Sweep

Find all skulls and terminals in Pillar of Autumn.

Successful Search

Find all skulls and terminals in Halo.

Plundered

Find all skulls and terminals in Truth and Reconciliation.

Buried Treasure

Find all skulls and terminals in Silent Cartographer.

Dust And Echoes Evolved

Complete The Maw.

Before the Fall

Complete Boarding Action.

Tiger Company

Complete The Most Dangerous Game.

Personal Space

Complete Heavy Burden.

Greenhorn

Complete the Campaign on Easy Difficulty.

Birth of a Spartan

Complete the Campaign on Normal Difficulty.

Heroes Never Die

Complete the Campaign on Heroic Difficulty.

Living Legend

Complete the Campaign on Legendary Difficulty.

Lore Have Mercy

Activate all 13 Terminals.

The Autumn Leaves

Complete Pillar of Autumn.

Stowed in Snow

Find all skulls and terminals in Assault on the Control Room.

Outpost Discoveries

Find all skulls and terminals in Two Betrayals.

Priorities

Find all skulls and terminals in Keyes.

No Rush

Find all skulls and terminals in The Maw.

Installation 04

Complete Halo.

Souvenirs

Find all skulls and terminals in Boarding Action.

Brute Loops

Find all skulls and terminals in The Most Dangerous Game.

Parting Gifts

Find all skulls and terminals in Heavy Burden.

Headhunter

Collect all 39 Skulls.

Collector's Addition

Find all skulls and terminals in the game.

REMIX!

Complete a Remixed Mission.

Beat the Drop

Complete a Remixed Mission without dying.

Mix Master

Complete an entire Remixed Campaign without dying.

Infiltration Anticipation

Complete Truth and Reconciliation.

Bad Gas

Destroy 100 Grunt backpacks.

Plate Tectonics

Break off 25 Hunter backplates.

New Whip

Hijack 10 Vehicles.

Make Them Count

Kill 100 enemies with headshots.

Hot Streak

With the Floor Is Lava Skull activated beat a mission without jumping or dying.

Even Tempered

With the Temperamental Skull activated beat Halo without upsetting anyone.

Like Old Times

Complete Two Betrayals with the Speed Limit, Endurance Spec, Hip Fire, and Armistice Skulls enabled.

Frugal Fire

Equip Famine, Recession, and Johnny Ammo Tree Skulls and beat a mission without running out of ammo.

Bee Thirty

Complete Silent Cartographer.

MYTHIC

Complete the Campaign with LASO enabled

This is My Ship Now

Eliminate Captain Keyes and trap his six avenging Marines in the Autumn's observation pen.

Map Quest

Complete The Silent Cartographer without shooting, using grenades, melee, dying, or restarting.

That's My Ride

On Assault on the Control Room get to the Banshee before the Elite

Arm's Length

On 343 Guilty Spark complete the first floor without taking a hit

Clean Lap

On The Maw complete the warthog run without being forcibly ejected from your vehicle.

Jiralhanae Conservationist

On The Most Dangerous Game don't kill any rampaging Brutes

Secret Achievement

All Shield, No Yield

Complete any level on Heroic difficulty or higher without taking health damage

Fully Evolved

Complete Every Achievement.

Control Alt Delete

Complete Assault on the Control Room.