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.
Completed 'Death Incarnate'
Acquired 100 attribute points in Spirit
Completed 'Zak's Temptation'
Acquired 100 attribute points in Dexterity
Acquired 100 attribute points in Melee
Completed 'Green Flames'
Completed 'The Ancient Covenant'
Killed 2000 monsters
Won the Arm-wrestling mini game 10 times
Completed 'The Swearing-in Ceremony'
Destroyed your soul rating until it was under 10
Acquired 100,000 gold
Picked 100 locks
Completed 'The Reactor'
Completed 'The Missing Gnome'
Completed 'The Oracle's Soldiers'
Dug up 10 treasures
Got at least 7 crew members on the ship
Collected 10 legendary items
Travelled by ship 20 times
Completed 300 quests
Raised your soul rating until it is over 90
Killed 500 monsters
Killed 50 Shadow Creatures
Killed 10 Scavengers
Completed 'The Kiss of the Dead'
Completed 'Chaos in Harbour Town'
Used the parrot 10 times
Completed 'Booze's Befuddled Mind'
Completed 'Water Source Conflict'
Completed 'The Blue Flower'
Completed 'A Follower of Magic'
Killed 20 innocent animals
Completed 'Menacing Shadows'
Completed 'Let's Get Out of Here'
Found the first treasure in the game
Acquired 1000 gold
Killed 10 monsters
Healed for the first time
Completed 'Cold Nights'
Completed 'Minions' Weapon Store'
Acquired 100 attribute points in Ranged
Acquired 100 attribute points in Cunning
Acquired 100 attribute points in Influence
Acquired 100 attribute points in Toughness
Acquired 100 attribute points in Magic
Used the monkey 20 times
Won the Drinking mini game 10 times
Won the Knife-throwing mini game 10 times
Acquired 300,000 gold