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.
Killed 20 ambient animals
'Kill Mara' completed
'Defeat the Kraken' completed
'The Split Soul' completed
'The Journey to the Underworld' completed
Collected 10 legendary items
'Steelbeard's Artefact' completed
'The Cunning Captain' completed
'The Greedy 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
'Garcia's Masquerade Uncovered' completed
'Following Garcia's Trail' completed
'A New Ship' completed
'The Titan Weapon' completed
'Four Muskets against Crow' completed
Killed 10 giant crabs
'Free Hawkins' completed
Drank first rum
Found first treasure in the game
'Become a Pirate' completed
Acquired 1000 gold
Won duel against Severin
'Find Steelbeard' completed
Killed 10 monsters
'Rescue Patty!' completed
'The Ancestors' Blessing' completed
Completed 250 quests
Learned each skill once
Travelled by ship 20 times
Used monkey 20 times
Won drinking duel mini-game 10 times
Picked 100 locks
Dug up 50 treasures
Acquired 100,000 gold
Acquired 300,000 gold
Collected 20 legendary items
Killed 2000 monsters
Killed 50 sea monsters
Killed 500 monsters
'The Air Temple' completed
'The Marooned Sailor' completed
Killed all gargoyles and gave their eggs to Eldric
Set course for Treasure Isle for the first time
Killed all alligators on Treasure Isle
Opened every deadly chest once