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