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.
Find the chest hidden near your house.
Discover the truth in the throne hall.
Get the treasure hunter badge from Giulia.
Find the hidden treasure of the Count.
Catch the butterfly in the depths.
Feed the worm from the depths.
Guess the kobold's name using the letters.
Use the snake ring at the best place.
Open the garden chest.
Catch Eisbein.
Find J.F.'s most important note.
Enter the fire room from a secondary door.
Find some stale bread before night falls.
Find the castle's wall at day.
Kill the old woman and Eisbein.
Guess the kobold's name without using the letters.
Get the fire room letter without using the bucket of water.