Here is the full list of all 18 Queen's Quest 3: The End of Dawn achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Finish every Hidden Object Scenes without using a hint.
Finish every the Mini-games without skipping any of them.
Defeat the Dragon Lord.
Destroy the machine powering the crystal.
Find every Collectable.
Complete the ritual.
Return the crystals to the witch.
Find 30 Collectables.
Complete a Hidden Object Scene in less than one minute.
Complete three Hidden Object Scenes in less than 10 minutes.
Find 3 hidden objects in three seconds.
Find the Dragon Crystals.
Open the library.
Complete five Mini-games without skipping them.
Complete a Mini-game in less than one minute.
Complete a Hidden Object Scenes without mistake.
Complete a Hidden Object Scene without using a hint.
Find one Collectable.