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