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