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