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