Here is the full list of all 50 WRATH: Aeon of Ruin achievements.
Kill a Wretch with another Wretch explosion
Stay underwater for 80 seconds
Enter Mourningvale
Find the set of Dark Armor from the previous Outlander
Find all secrets in one map
Enter the Isle Of The Dead
Deflect 100 projectiles with Orbs of Deflection
Collect 100 Souls with the Mace of Devastation
Heal 1,000 Lifeblood with Life Siphons
Kill 3 flying enemies with one Void Grenade
Kill 10 enemies with one Shockwave
Kill 10 enemies with Confounding Attars
Kill 10 enemies with Vicious Animus turrets
Deal 40,000 damage with one Flask of Rage
Kill 5,000 enemies
Kill 100 enemies with the Blade of Ruination
Kick 100 heads
Collect all the Notes in WRATH
Use 10 Soul Tethers
Shoot all the eyes in the Blood Pits
Destroy all the statues in the Shadow Pantheon
Stay in lava for 15 seconds
Cannonjump with the Slag Cannon
Kill an enemy with a planted Cyst
Kill multiple enemies with one shot of the Shotgun's secondary fire
Hit 5 enemies from one Crystalized enemy
Kill an enemy while at 1 health, without the Cruel Aegis
Defeat the Dreadful One using only the Blade and Mace
Defeat the Lord of Etherion within 3 minutes
Defeat the Lady of Ascension without taking damage
Beat WRATH on Outlander difficulty
Beat WRATH
Open all the coffers in WRATH
Open half the coffers in WRATH
Find all secrets in WRATH
Find all secrets in the Wretched Domain
Find all secrets in the Eventide Wastes
Find all secrets in Mourningvale
Shut off the factory pipes in the Rending Chambers
Find Kells' Cage in the Crucible of Souls
Find the keyhole secret in the Mire
Find the Crystallizer beneath the Crystal Dunes
Defeat the Dreadful One
Expose the core in the Red Throne
Defeat the Lord of Etherion
Start up the Orrery in the Watchtowers
Enter the Eventide Wastes
Defeat the Lady of Ascension
Enter the Wretched Domain
Find the only underlift secret in WRATH