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