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