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