Welcome to this little listing. It's really nothing big or special, but I was really overwhelmed by trying to pry apart the achievements connected to specific factions. This guide is supposed to help everybody with the same problem, people who like organised lists and anybody else, really. I hope my work can be useful to you, too.

For those looking for tips on how to unlock specific achievements I recommend this detailed and truly exhaustive guide by Doc:

https://steamproxy.net/sharedfiles/filedetails/?id=2801059818

Additionally, for some details or alternative routes for some of the tricker achievements I also recommend this guide by VeldMuis:

https://steamproxy.net/sharedfiles/filedetails/?id=2329668148

Finally, there is this amazing Google Docs Spreadsheet[docs.google.com] for all you achievement trackers out there that's based on this listing by the amazing Koger. Everybody say thank you!!

And now on to an organised overview of all achievements!

The following achievements can only be unlocked in singleplayer:


There Is No War
Win a solo game without killing any units that are not headquarters

Pugio
Win a solo game on medium difficulty or higher

Sica
Win a solo game on hard difficulty or higher

Falx
Win a solo game on very hard difficulty or higher

Gladius
Win a solo game on ultra hard difficulty or higher

Spatha
Win a solo game on impossible difficulty

Mission Improbable
Win a solo game on impossible difficulty by finishing the story quest

Who Guards the Guard?
Win a solo game on impossible difficulty against Atra Militarum on a huge map

Chapter Approved
Not as Space Marines, win a solo game on impossible difficulty without founding a second city

The following achievements can only be unlocked in multiplayer:


Entry To Eternal War
Finish a multiplayer game with another human player

The Players That Team Together
Start a multiplayer game with a team of human players against a team of AI opponents

Militarily Distanced
Win a multiplayer game against a human opponent

Fireside Fratricide
Finish a hotseat game

Zhuko Was Here
Win a game as ZhukoDim, but without playing
Note: Requires to spectate a two player game.

Hero Worship
Win a multiplayer game by producing only heroes

Serial Winner
Win 10 multiplayer games

Battle Royale
Win a solo game against 10 AIs on a tiny map.

All of the following achievements are technically possible anywhere and with anyone.
A good chunk of these will unlock with the tutorial.


Where It All Starts
Found a city

Second Foundation
Found a second city
Note: actually not possible with any faction, but with any faction besides the Space Marines

Breaking Ground
Construct a building

Land Grab
Acquire a tile

Top Clearance
Clear a tile

There Are Only Warriors
Produce a unit

I Need A Hero
Recruit a hero

Super Trooper
Attain the highest level with a unit

A Little Knowledge...
Research a technology

An STC?!
Research all technologies with any one faction

Airstrip One
Develop a city to 25 loyalty or more

Planting The Flag
Capture an outpost

Know It Vaul
Explore 20 ruins

The Living Stone
Ian got you to capture an artefact
Note: After discovering an artefact, you have to claim it with one of your hero units

Prime Mover
Explore the whole map

Rogue Trader
Buy an item from a Jokaero Trader Encampent
Note: This is only possible by moving a hero onto a JTE tile

Dragged Back In
Restore a unit's morale with Laurels of Command
Note: Laurels of Command is one of the items obtainable at the Trade Encampments

Nothing But A Hound Dog
Kill some Kroot Hounds

In The Shadow of Death
Kill a unit of Neophyte Hybrids while they are shrouded

An Ethereal's Solution
Free an enslaved unit

A Commissar's Solution
Kill an enslaved unit

Devil May Cry
Destroy a Catachan Devil Lair

Burnt Umbra
Kill an Umbra with a Flame or Melta weapon
Note: Space Marines are probably the easiest faction for this, but other factions have the neccessary weapons too

C'tan Opener
Kill a C'tan
Note: While technically possible with any faction, this achievement is easiest to achieve with the Space Marines because one or more C'tans spawn as part of the story quest.

Skulls For The Skull Throne
Kill the Lord of Skulls
Note: This requires the Lord of Skulls DLC

Life, But Not As We Know It
Eliminate all native life on Gladius

The Walls Came Tumblin' Down
Destroy an enemy city

Primal Rage
Eliminate a faction

It Was Beauty Killed The Beast
Kill a Scythed Hierodule with a flyer.
Note: This requires the Assault Pack DLC. Requires Tyranids as an enemy faction.

Welcome to the grind.


Beardy
Win with every faction

Blessed Sacrifice
The Chaos Gods take their pawns' lives with as much glee as their foes'
Note: You have to lose 1,000 units. This tracks across all your games.

Brother Get The Flamer - The Heavy. Flamer
Destroy 100 units with flame weapons

Roughneck
Kill 1000 Tyranids
Note: This requires the Tyranid DLC

There Is Only War
Kill 40,000 units

The following achievements are exclusive to the Sisters of Battle:


Enforcers of the Faith
Win as the Adepta Sororitas

The Final Countdown
Finish the Adepta Sororitas story

Never Give Up!
As Adepta Sororitas, win a solo game on impossible difficulty without breaking the morale of any of your units

The Purge
As Adepta Sororitas, win a solo game on impossible diffiulty against Necrons, Craftworld Aeldari, T'au, Tyranids, Chaos Space Marines and Orks

Archaeologist
As Adepta Sororitas, make sure all Holy Sites on the map are explored

That's a Lot of Talking
Increase by a total of 100 points the armour of allied Adepta Sororitas units using "Stirring Rhetoric"

Miracle Maker
Perform 100 Acts of Faith

Ain't So Scared Anymore
As the Adepta Sororitas, kill an enemy unit that has the Oath of Faith trait

It's Avenging Time!
Kill an enemy unit with an Avenger Strike Fighter that has the trait Avenging Zeal or Bloody Resolution

Harder, Better, Faster, Stronger
Kill a Knight Crusader with a Cerastus Knight-Lancer
Note: Requires the Adeptus Mechanicus as an enemy faction

Witch Hunter
Kill a Psyker unit with a Canoness
Note: Requires an enemy faction with psyker units, e.g. Atra Militarum

Steam Cooking
Destroy a loaded transport with a Retributor unit

Righteous Executioner
Kill 3 heroes with Saint Celestine in a single game

The following achievements are exclusive to the Omissiah's prophets:


Life on Mars
Win as the Adeptus Mechanicus

Omniscient? Omnissiah Ain't
Finish the Adeptus Mechanicus story

Adeptus Monotonus
As Adeptus Mechanicus, win a solo game on impossible difficulty by producing units only from Sub-Cloisters

You Said The Magic Word
Reprogram 10 Kastelan Robots

Citadel Miniatures
Construct 20 buildings adjacent to your headquarters tile

Xenarite Heretic
Power Surge a tile with 4 Librarium Omnis buildings

Canonically Faster
Attack a Leman Russ Battle Tank with a Rapid-Fire Battle Cannon
Note: Requires the Astra Militarum as an enemy faction

Metal Anthem
Use a Canticle of the Omnissiah on 10 units

...The Harder They Fall
Attack a 10 armour unit with a Graviton weapon

Shock Jock
Take damage while Siphoned Vigour is active

Master of Machines
As Adeptus Mechanicus, repair 100 units

So Close Yet So Different
Kill a Kataphron Destroyers unit with a Kataphron Breachers unit.
Note: This requires the Firepower Pack DLC.

The following achievements are exclusive to the Imperial Guard:


We Have Tanks On Our Side
Win as the Astra Militarum

Teching No Prisoners
Finish the Astra Militarum story

Dictum Administratum
Start an Astra Militarum city edict

Nothing Stops The Storm Troopers
Enter difficult terrain with a unit of Tempestus Scions

Innocence Is No Defence
Execute a coward

Yarrick Did It With One Arm
Kill a Warboss with a Lord Commissar
Note: Requires Orks as an enemy faction.

Drive Me Closer, I Want To Hit Them With My Sword
Kill a unit of Ork Boyz with a Tank Commander's roll over them ability
Note: Requires Orks as an enemy faction

Empty Nest
Maintain 3 Void Shield Generators on the field at once
Note: This requires the Fortification Pack DLC

Don't Spare The Horses
Transport a Lord Commissar with Aura of Discipline in a Chimera
Note: This requires the Assault Pack DLC

The Mouse That Roared
Kill a hero with a Ratling
Note: This requires the Specialist Pack DLC

The following achievements are exclusive to the Angels of Death:


The Emperor Protects
Win as the Space Marines

Pyrrhic Victory
Finish the Space Marine story

Special Delivery
Deploy a Space Marine chapter tactic

Taxi!
Disembark a unit from a Land Raider

Battle Focused
Move a unit after using an action
Note: The scout bikes have an ability that grants additional movement

Succession Guaranteed
Attain the highest level with a Space Marine Scout unit
Note: This requires the Escalation Pack DLC.

A Long Shot, But It Might Just Work
Kill an enemy unit with the Aquila Macro Cannon at maximum range
Note: This requires the Fortification Pack DLC

Rubicon Primaris
As Space Marines, win a game recruiting only Primaris units
Note: This requires the Ultima Founding DLC

Extremely Repulsive
As Space Marines, control 10 Primaris Repulsor Executioners at the same time
Note: This requires the Ultima Founding DLC

The following achievements are exclusive to the Heretic Astartes:


Warmaster
Win as the Chaos Space Marines

A Whole New World
Finish the Chaos Space Marines story

Killing Joke
Heal a unit with Bloated

In Death, Life
Sacrifice Chaos Cultists to boost growth on a city with an active Rite of Chaos and Our Lives for the Gods researched

Something Wicked This Way Comes
Use Master of Possession's Incursion while under the effects of Venomcrawler's Reservoir of Daemonic Energy

I'll Huff And I'll Puff...
Destroy a fortification with a Maulerfiend

Apotheosis
Transform Chaos Cultists into a Daemon Prince

Apocolocyntosis
Transform Chaos Cultists into Chaos Spawn

A Good Servant
These icons shine brightly in the Warp, gathering the malefic energies of Chaos to those who bear them
Note: Research and bestow all Marks of Chaos

Ram Raider
Even the Empire's mightiest war machines are fodder to a Chaos Lord
Note: Requires Space Marines as enemies or progress through the Chaos Space Marine story quest for the necessary enemy unit to spawn. For a detailed instructions, refer to the guide linked in the introduction.

The Sound of Unsilence
Prevent 3 units from doing overwatch attacks with a Chaos Rhino with full cargo

Stuck In The Middle With You
Blind 5 units with Warp Talons in a single jump

Crown of Throns
Kill an enemy Psyker with a Noctilith Crown
Note: This requires the Fortification Pack DLC. Requires an enemy faction with psyker units, e.g. Astra Militarum

Bug on Bug Warfare
Kill a Catachan Devil with a Greater Brass Scorpion
Note: This requires the Firepower Pack DLC.

The following achievements are exclusive to the Children of Asuryan:


Rage Against The Dying of The Light
Win as the Craftworld Aeldari

The Anvil of the Gods
Finish the Craftworld Aeldari story

Webway Guardian
As Craftworld Aeldari, win a game without any Webway Gates getting destroyed

Rhana Dandra
Win a solo game on impossible difficulty as Craftworld Aeldari on a huge map against a team of 2 AI Chaos Space Marines

Where There's A Web, There's A Way
Play a game where a Webway Redoubt is constructed on each Webway Gate

Autarchy In The UK
Buff 5 units with Autarch's Assault

Psychonautica
Kill a unit with a Farseer's Mind War

Fatal Refraction
Kill a unit with a linked fire Fire Prism

Blood For... The Other Blood God?
Produce an Avatar of Khaine

The Banshee's Call
Affect 3 units with Howling Banshee's War Shout

Scorpio and Orion
Move a Scorpion side-by-side with an allied Wraithknight

The following achievements are exclusive to Slaanesh's favourite little snacks:


How The Tables Have Turned
Finish the Drukhari story.

Delightful Sufferings
Win as the Drukhari.

Explosive Delivery
As Drukhari, deal 20 damage in one attack with a unit with Raider Assault.

Secured Merchandise
As Drukhari, control all outposts.

Supreme Ruler
As Drukhari, gather 1000 influence in one game.

Mortal Beauty
Kill 3 units with a Succubus with one use of the Whirling Death ability.

Multitasking
Kill 2 units in a single turn with an Archon.

Troublemaker Twins
As Drukhari, win a game with an allied Craftworld Aeldari on medium difficulty against a team of Adepta Sororitas, Adeptus Mechanicus, Astra Militarum and Space Marines on impossible difficulty. This can also be completed in multiplayer.

Poison Supporters Gathering
As Drukhari, win a solo game by producing only units with poisoned weapons (Haemonculus, Hellions, Kabalite Warriors, Razorwing Jetfighter, Succubus, Venom, Wracks).

Five Star Shipping
Fill a Tantalus with allied non-Drukhari units.

The following achievements are exclusive to those reawakened from their Tombs:


A Test of Metal
Win as the Necrons

Safe From The Old Ones
Finish the Necron stry

Wake Up, Sleepyheads
Use rapid rise

Immortal Kombat
Kill a unit of Guardsmen with a unit of Immortals from range 2
Note: This requires the Astra Militarum as opponents

Down To Earth
Kill a superheavy flyer with a Gauss Pylon
Note: This requires the Fortification Pack DLC

The following achievements are exclusive to the galaxy's least intelligent fungus:


Another Green World
Win as the Orks

Intergalactic Headbutt
Finish the Ork story

WAAAGH!
Reach maximum Waaagh!

Snazzy Digs
Attack with Flash Gitz without moving

Super-Brolly 2000
Use a Big Mek's shield to reduce ranged damage taken by your unit
Note: This requires the Fortification Pack DLC

The following achievements are exclusive to the Greater Good:


I Did It, My Way
Win as the T'au

Farsighted
Win the game with a Commander on the field

Consequentialism In Action
Finish the T'au story

Monat
Attain the highest level with a Fire Warrior

For Great Space Communism!
As T'au, convert 10 units to your side

John Stuart Mill Was Particularly Ill
As T'au, convert 20 units to your side

I Am Kroot
Have a unit of Kroot Hounds kill another unit of Kroot Hounds

Tau Can Play At That Game
As T'au, kill a unit with melee

Dark Messiah
Kill a unit with an Ethereal

Supporting Fire Warriors
As T'au, kill 10 enemy units that are next to other friendly units with overwatch

Utopia
As T'au, build every type of building in a city with no duplicates

The Golden Drone
Create 20 drones

Suited and Booted
Have 10 battlesuit units on the field at once

Argon Genesis Devilalion
Kill a Dreadnought unit with a battlesuit unit
Note: To unlock this, you need to play against a Space Marine enemy

Any Support In A Storm
Install 10 support systems

It Takes Tau
Start a match in a team with another T'au player

Weapons of Mass Construction
Construct 5 Tidewall Gunrigs in 1 turn
Note: This requires the Assault Pack DLC

Friendly Fire For The Greater Good
Kill both an allied unit and an enemy unit at once with the XV107 R'Varna using the Nova Electromagnetic Shockwave ability.
Note: This requires the Firepower Pack DLC

The following achievements are exclusive to the hive fleet:


Roadside Picnic
Win as the Tyranids

The Doom
Finish the Tyranid story

We Can Rebuild Him
Reclaim a unit

Brain Food
Kill a hero with a Lictor's overwatch

Rock Around The Clock
Turn all land tiles on the map into bedrock

Haru, Is It Me You're Looking For?
Win a solo game by only creating Haruspex units

What Is Yours, Is Mine
Kill 10 units with Spore Mines
Note: This requires the Fortification Pack DLC

You Call That A Scythe?
Stomp a Carnifex with a Scythed Hierodule
Note: This requires the Assault Pack DLC

And that's it! If there are going to be more DLCs that bring more achievements, I definitely will update this. Until then, I wish everybody good luck and a lot of fun conquering Gladius.