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