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