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 Demonblood
Ending #5
Saved the world as the Worthless
Ending #2
Saved the world as the Adventurer
Ending #1
Ending #4
Highest possible reputation
Saved the world as the Rogue
Ending #3
Level 20 Adventurer
Activated all monoliths
Activated all Guardian Beacons
Level 10 Adventurer
Saved the world as the Warrior
Saved the world as the Mage
Saved the world as the Beastkin
Saved the world as the Ascended
Lowest possible reputation
Saved the world as the Necromancer
Fully upgraded a skill
Learn an ancient spell