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