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