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