Here is the full list of all 32 The Count Lucanor achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Get the treasure hunter badge from Giulia.
Find the hidden treasure of the Count.
Discover the truth in the throne hall.
Catch the butterfly in the depths.
Feed the worm from the depths.
Guess the kobold's name without using the letters.
Guess the kobold's name using the letters.
Open the garden chest.
Catch Eisbein.
Kill the old woman and Eisbein.
Use the snake ring at the best place.
Find J.F.'s most important note.
Get the fire room letter without using the bucket of water.
Enter the fire room from a secondary door.
Find the castle's wall at day.
Find the chest hidden near your house.
Find some stale bread before night falls.