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