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