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