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.
Acquired 100 attribute points in Dexterity
Acquired 100 attribute points in Spirit
Acquired 100 attribute points in Magic
Acquired 100 attribute points in Toughness
Acquired 100 attribute points in Cunning
Acquired 100 attribute points in Ranged
Used the monkey 20 times
Completed 'Cold Nights'
Destroyed your soul rating until it was under 10
Completed 'The Swearing-in Ceremony'
Killed 2000 monsters
Won the Knife-throwing mini game 10 times
Won the Drinking mini game 10 times
Completed 'Death Incarnate'
Acquired 100 attribute points in Influence
Completed 'Minions' Weapon Store'
Acquired 300,000 gold
Acquired 100,000 gold
Completed 'The Oracle's Soldiers'
Completed 'The Reactor'
Acquired 100 attribute points in Melee
Completed 'Green Flames'
Completed 'The Missing Gnome'
Picked 100 locks
Raised your soul rating until it is over 90
Dug up 10 treasures
Got at least 7 crew members on the ship
Travelled by ship 20 times
Completed 'A Follower of Magic'
Completed 'Zak's Temptation'
Completed 300 quests
Completed 'The Ancient Covenant'
Won the Arm-wrestling mini game 10 times
Collected 10 legendary items
Killed 500 monsters
Killed 50 Shadow Creatures
Completed 'Booze's Befuddled Mind'
Completed 'The Kiss of the Dead'
Completed 'Water Source Conflict'
Completed 'The Blue Flower'
Used the parrot 10 times
Killed 20 innocent animals
Completed 'Menacing Shadows'
Killed 10 Scavengers
Completed 'Chaos in Harbour Town'
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