Full list of all 49 Risen 2: Dark Waters achievements. It takes around 35-40 hours to unlock all of the achievements in the base game on Windows.
The base game contains 43 achievements, and there are 2 DLC packs containing 6 achievements.
Travelled by ship 20 times
'Four Muskets against Crow' completed
Collected 20 legendary items
Killed 50 sea monsters
Killed 20 ambient animals
Acquired 100,000 gold
Acquired 300,000 gold
Killed 10 giant crabs
Learned each skill once
Used monkey 20 times
'Kill Mara' completed
'Defeat the Kraken' completed
'The Split Soul' completed
Collected 10 legendary items
Drank first rum
'Steelbeard's Artefact' completed
'The Journey to the Underworld' completed
'The Greedy Captain' completed
'Garcia's Masquerade Uncovered' completed
'The Cunning Captain' completed
At least 5 crew members on the ship
'Build a Raft' completed
'The Gnome Eater' completed
'Ship's Equipment' completed
'Chaka Datu's Legacy' completed
'Following Garcia's Trail' completed
'A New Ship' completed
'Free Hawkins' completed
'The Titan Weapon' completed
'The Ancestors' Blessing' completed
Found first treasure in the game
Acquired 1000 gold
'Become a Pirate' completed
'Find Steelbeard' completed
Killed 10 monsters
Won duel against Severin
'Rescue Patty!' completed
Completed 250 quests
Won drinking duel mini-game 10 times
Picked 100 locks
Dug up 50 treasures
Killed 2000 monsters
Killed 500 monsters
Killed all gargoyles and gave their eggs to Eldric
'The Marooned Sailor' completed
'The Air Temple' completed
Opened every deadly chest once
Set course for Treasure Isle for the first time
Killed all alligators on Treasure Isle