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