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.
Destroyed your soul rating until it was under 10
Killed 2000 monsters
Completed 'The Kiss of the Dead'
Completed 'Zak's Temptation'
Completed 'The Ancient Covenant'
Completed 'Minions' Weapon Store'
Acquired 100 attribute points in Ranged
Completed 'Death Incarnate'
Acquired 300,000 gold
Acquired 100,000 gold
Acquired 100 attribute points in Toughness
Used the monkey 20 times
Acquired 100 attribute points in Cunning
Acquired 100 attribute points in Melee
Acquired 100 attribute points in Influence
Acquired 100 attribute points in Spirit
Completed 'Cold Nights'
Acquired 100 attribute points in Dexterity
Acquired 100 attribute points in Magic
Completed 'The Oracle's Soldiers'
Picked 100 locks
Completed 'The Reactor'
Completed 'Green Flames'
Completed 'The Blue Flower'
Completed 'Booze's Befuddled Mind'
Won the Knife-throwing mini game 10 times
Completed 'Water Source Conflict'
Used the parrot 10 times
Raised your soul rating until it is over 90
Won the Arm-wrestling mini game 10 times
Travelled by ship 20 times
Completed 300 quests
Dug up 10 treasures
Killed 500 monsters
Collected 10 legendary items
Won the Drinking mini game 10 times
Completed 'A Follower of Magic'
Got at least 7 crew members on the ship
Killed 50 Shadow Creatures
Completed 'Menacing Shadows'
Killed 10 Scavengers
Completed 'The Swearing-in Ceremony'
Completed 'Chaos in Harbour Town'
Killed 20 innocent animals
Completed 'The Missing Gnome'
Completed 'Let's Get Out of Here'
Killed 10 monsters
Acquired 1000 gold
Found the first treasure in the game
Healed for the first time