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 'Cold Nights'
Won the Drinking mini game 10 times
Acquired 300,000 gold
Completed 'Death Incarnate'
Completed 'Minions' Weapon Store'
Completed 'Green Flames'
Completed 'The Reactor'
Acquired 100,000 gold
Completed 'Menacing Shadows'
Used the monkey 20 times
Completed 'A Follower of Magic'
Completed 'Zak's Temptation'
Completed 'The Oracle's Soldiers'
Acquired 100 attribute points in Cunning
Acquired 100 attribute points in Spirit
Acquired 100 attribute points in Influence
Acquired 100 attribute points in Magic
Acquired 100 attribute points in Toughness
Acquired 100 attribute points in Ranged
Acquired 100 attribute points in Melee
Acquired 100 attribute points in Dexterity
Picked 100 locks
Travelled by ship 20 times
Dug up 10 treasures
Got at least 7 crew members on the ship
Completed 'The Swearing-in Ceremony'
Completed 'The Kiss of the Dead'
Completed 'The Ancient Covenant'
Won the Arm-wrestling mini game 10 times
Won the Knife-throwing mini game 10 times
Raised your soul rating until it is over 90
Completed 300 quests
Killed 50 Shadow Creatures
Killed 500 monsters
Collected 10 legendary items
Completed 'The Missing Gnome'
Used the parrot 10 times
Completed 'Water Source Conflict'
Completed 'Booze's Befuddled Mind'
Completed 'The Blue Flower'
Completed 'Chaos in Harbour Town'
Killed 20 innocent animals
Completed 'Let's Get Out of Here'
Killed 10 Scavengers
Acquired 1000 gold
Found the first treasure in the game
Killed 10 monsters
Healed for the first time