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