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