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