Complete the indicated task to unlock the achievement.

Achievement	How to unlock
A Blight to Be Purged	Kill 20,000 enemies (all game modes combined)
An End to Heresy	Kill a Lesser Sorcerer while he's reviving a Rubric Marine.
Bespoke	Customise a full Armour set for one Class.
Break of Dawn	Discover the true nature of the Aurora device.
Chaos All Along	Discover the Chaos presence on Kadaku.
Crude but Effective	Deploy a bomb in the promethium well to destroy the Tyranid swarm.
Data Mining	Collect all Dataslates.
Dead Center	As a Sniper, make 250 Headshots.
Defender of Humanity	Overcome every challenge and achieve ultimate victory.
Dominator	Play ten Seize Ground matches in Eternal War mode.
Douse the Flames	Destroy the Chaos warp beacon.
Enemy Revealed	Defeat the Chaos sorcerer.
Field of Battle	Kill hundred enemies using environmental hazards.
Furious Retribution	Kill hundred enemies using Righteous Fury.
Glorious Victory	Win any match in Eternal War mode.
Guardian's Might	As a Bulwark, kill hundred enemies with every available Melee Weapon.
I'll Be Watching You	Defeat the Lord of Change and face a figure from the past.
Immovable Object	As a Heavy, kill 500 enemies while in Heavy Stance.
Into the Abyss	Withstand and overcome the Chaos invasion.
Know No Fear	Break a Scarab Occult Terminator's Melee Combo Attack with two Perfect Parries in a row.
Lightning Strike	As a Vanguard, perform hundred Gun Strikes.
Master of Arsenal	As a Tactical, kill 25 enemies with every available Primary Weapon.
Merciless	Achieve a streak of five kills without dying in Eternal War mode.
My Face Is My Shield	Hit ten objects during the sub-orbital drop.
One Ugly Xenos	Bring down a Lictor before it attacks from an ambush.
Outbound Payload	Deliver a nova cannon warhead to the Tyranid position.
Principia Imperialis	Find 200 pickups in Operations mode.
Purge Them All	Mark every enemy type.
Resurrection	Reanimate The Sword of Atreus.
Sharpest Edge	Reach the maximum Level for one Melee Weapon.
Sic Semper Tyrannis	Kill the Hive Tyrant.
Silence	Kill five enemies while they are conducting a Call for Reinforcements.
Still a True Son of the Emperor	Kill 41,000 Enemies (all game modes combined)
Strategic Specialty	Reach the maximum Level for one Class.
Strongest Shot	Reach the maximum Level for one Ranged Weapon.
Tactical Genius	Win a match in Eternal War mode with every Class.
Target Acquired	Ascertain the location of Morias Leuze.
The Art of Dismemberment	Perform fifty unique Finishers.
The Die Is Cast	Rise as a Primaris.
The Thousand Dead Sons	Kill thousand Chaos servants in Operations mode.
Thunderous Impact	As an Assault, hit 500 total enemies with Ground Pound.
Unhand My Brother!	Force a Ravener to release a grabbed Squad Member.
Unleash the Cannon	Destroy the hive ship with the power of anti-aircraft batteries.
Unwavering Faith	Play ten Capture and Control matches in Eternal War mode.
Valour Crest	Complete any Mission in Operations mode on Ruthless Threat Level.
Vital Asset	Rescue Morias Leuze from the Chaos assault.
Voice in the Dark	Eliminate the Daemonhost and restore vox communication.
War Machine	Play ten Annihilation matches in Eternal War mode.
Why Is It Always You Three?	Hear all of the Chaplain's dialogues.
Xenos Exterminator	Kill thousand Tyranids in Operations mode.