Full list of all 56 Risen 2: Dark Waters achievements worth 1,100 gamerscore. It takes around 60-80 hours to unlock all of the achievements in the base game.
The base game contains 50 achievements worth 1,000 Gamerscore, and there are 2 DLC packs containing 6 achievements worth 100 Gamerscore.
Killed 2000 monsters
Learned each skill once
Learned everything about voodoo
'The Ancestors' Blessing' completed
'Following Garcia's Trail' completed
'Garcia's Masquerade Uncovered' completed
'Ship's Equipment' completed
'Steelbeard's Artefact' completed
Hit 10 times in one game in the shooting mini-game
Collected 10 legendary items
Killed 500 monsters
'Chaka Datu's Legacy' completed
'The Gnome Eater' completed
'Build a Raft' completed
'The Cunning Captain' completed
Learned everything about blades
Travelled by ship 20 times
'The Greedy Captain' completed
Learned everything about firearms
Learned everything about toughness
Learned everything about cunning
At least 5 crew members on the ship
Picked 100 locks
'The Journey to the Underworld' completed
'The Split Soul' completed
'Defeat the Kraken' completed
'Kill Mara' completed
Used parrot 5 times
Used monkey 20 times
Won drinking duel mini-game 10 times
Collected 20 legendary items
Drank first rum
Completed 250 quests
'A New Ship' completed
'Free Hawkins' completed
'The Titan Weapon' completed
'Four Muskets against Crow' completed
Acquired 300,000 gold
Acquired 100,000 gold
Dug up 50 treasures
Killed 20 ambient animals
Won duel against Severin
'Become a Pirate' completed
Killed 50 sea monsters
Killed 10 giant crabs
'Find Steelbeard' completed
Found first treasure in the game
Killed 10 monsters
'Rescue Patty!' completed
Acquired 1000 gold
Set course for Treasure Isle for the first time
Killed all alligators on Treasure Isle
Opened every deadly chest once
'The Marooned Sailor' completed
Killed all gargoyles and gave their eggs to Eldric
'The Air Temple' completed