Here is the full list of all 44 Darkestville Castle achievements.
Finish The Game.
Run into Vigo for three times.
Finish The Third Chapter.
Find a message from Cid’s parents and get the detonator.
Summon the ghost and talk through every dialogue option with him.
Find a secret entrance at the Lavafall.
Build a bridge over the Lavafall.
Buy video recorder back.
Try every drink at the bar and find 3 diamonds.
Meet Alberto.
Read the whole book about ghosts.
Read the Survivalist Magazine.
Finish The Interlude.
Solve the Underworld Gateway puzzle.
Try all possible Underworld Gateway password combinations.
Finish The Second Chapter.
Fulfil every strike demand of Pig Demon.
Cure both Mongoose and Walrus.
Get Walrus his coffee.
Talk with Giovanny in the Tavern about T.Rex.
Win at dice with sugar cubes.
Talk with Pig Demon about joining Demon Trade Union.
Have a look at every demon in Darkestville.
Talk with Sailor Demon about his… ship and find a way to get it from him.
Get a tomato and talk through every dialogue option with Vegetable Demon.
Talk through every dialogue option with Werewolf by the tavern.
Talk with Jeff about Good stuff.
Get out of the castle cell.
Finish The First Chapter.
Get all 3 keys.
Try to flirt with Foxy.
Ask all three of Romero brothers about Dan.
Read the whole biology textbook.
Get the second key.
Give some sedative to Walrus.
Have a look at every tombstone in Darkestville.
Have a look at every single person in Darkestville.
Try to find a secret safe behind every picture in Darkestville.
Poke around in every trashcan in Darkestville.
Finish the prelude.
Fix the broken machine in the basement.
Talk through every dialogue option with Dan.
Use the hint option for a fist time.
Talk through every dialogue option with Fly.