Here is the full list of all 50 Risen 3 - Titan Lords achievements. It takes around 60-80 hours to unlock all of the achievements on Windows.
Completed 'Death Incarnate'
Killed 2000 monsters
Completed 'Minions' Weapon Store'
Completed 'The Reactor'
Completed 'The Oracle's Soldiers'
Completed 'Green Flames'
Completed 'Zak's Temptation'
Got at least 7 crew members on the ship
Completed 'The Ancient Covenant'
Completed 'The Kiss of the Dead'
Completed 'The Swearing-in Ceremony'
Completed 'Menacing Shadows'
Destroyed your soul rating until it was under 10
Completed 'A Follower of Magic'
Acquired 100 attribute points in Spirit
Acquired 100 attribute points in Magic
Acquired 100 attribute points in Influence
Acquired 100 attribute points in Cunning
Completed 'The Blue Flower'
Acquired 100 attribute points in Ranged
Completed 'Booze's Befuddled Mind'
Completed 'Water Source Conflict'
Acquired 100 attribute points in Toughness
Acquired 100 attribute points in Melee
Acquired 300,000 gold
Acquired 100,000 gold
Dug up 10 treasures
Acquired 100 attribute points in Dexterity
Used the monkey 20 times
Picked 100 locks
Completed 300 quests
Killed 500 monsters
Won the Drinking mini game 10 times
Completed 'Cold Nights'
Travelled by ship 20 times
Collected 10 legendary items
Raised your soul rating until it is over 90
Killed 50 Shadow Creatures
Completed 'Chaos in Harbour Town'
Won the Knife-throwing mini game 10 times
Used the parrot 10 times
Won the Arm-wrestling mini game 10 times
Completed 'The Missing Gnome'
Killed 20 innocent animals
Killed 10 Scavengers
Completed 'Let's Get Out of Here'
Acquired 1000 gold
Found the first treasure in the game
Killed 10 monsters
Healed for the first time