Here is the full list of all 27 Kingsway achievements.
The base game contains 21 achievements, and there is 1 DLC pack containing 6 achievements.
Saved the world as the Ascended
Saved the world as the Worthless
Saved the world as the Beastkin
Saved the world as the Mage
Ending #4
Saved the world as the Warrior
Ending #3
Saved the world as the Demonblood
Ending #2
Lowest possible reputation
Ending #5
Activated all monoliths
Saved the world as the Adventurer
Level 20 Adventurer
Highest possible reputation
Saved the world as the Rogue
Ending #1
Activated all Guardian Beacons
Level 10 Adventurer
Saved the world as the Necromancer
Learn an ancient spell
Fully upgraded a skill