Full list of all 78 For The King achievements. It takes around 80-100 hours to unlock all of the achievements in the base game on Windows.
The base game contains 72 achievements, and there is 1 DLC pack containing 6 achievements.
Kill 1000 Enemies
Unlock 40 items from the Lore Store
Complete 50 Side Quests
Enter Hildebrant's Cellar
Find Bradach's Cabin
Slay the dragon at the top of Frostbite Peak
Have 5000 Gold
Have 1500 Gold
Unlock the armory
Defeat the Yeti, free her "prisoner"
Break a sieged town
Help Hildebrant retrace his steps
Unlock 20 items from the Lore Store
Defeat the Hangman
Topple 15 Crag Monsters
Honor 15 Stone Heros
Escape the Mage Dungeon
Defeat 3 Triclops
Solve the King's Maze
Defeat the Chaos Beast
Defeat Disciple
Defeat the Old One
Defeat the Royal Droll
Use 100 herbs
Defeat Lucky
Clear a Cave
Unlock 1 item from the Lore Store
Use 10 candies
Defeat the Mind Bender
Honor 3 Stone Heros
Defeat the Bandit King
Have 300 Gold
Defeat the Foul Priestess
Clear the Forgotten Cellar
Defeat Deimos
Defeat the Lich's Crypt
Kill a thief attempting to flee
Break a weapon
Defeat Coal Heart
Purge the Glittering Mines
Revive a party member
Defeat the Cultist Camp
Complete 1 Side Quest
Clear 5 Sea Caves in 1 game
Fly in the Air Balloon
Defeat Vexor on Apprentice
Defeat Vexor on Journeyman
Defeat Vexor on Master
Purge the Buried Temple
Clear the Flooded Crypt
Reach the top of Harazuel
Survive the Lava Dungeon
First party wipe
Clear both Demon Caves
Honor 50 Stone Heros
Kill the Kraken
Defeat 100 Beastmen
Smash 150 Skellys
Murder 30 Hags
Defeat 10 Mimics
Crush 25 Imps
Kill 5 Snowmen
Reach the bottom of Hildebrant's Cellar
Reach the Inferno
Win a game of Gold Rush
Purge all 4 Water Temples
Find Captain Greenbeard's Ship
Defeat the Sea King
Defeat the Songstress
Kill 30 Fishfolk
Kill 10 enemies with Firearms
Get killed by a suicidal enemy