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