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