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