Here is the full list of all 19 Queen's Quest 3: The End of Dawn trophies - there are 6 bronze, 2 silver, 10 gold and 1 platinum.
Unlock every Trophy.
Find all collectables.
Defeat the Dragon Lord.
Finish all the Minigames without skipping them.
Destroy the machine powering the crystal.
Finish all the Hidden Object Puzzles without using a hint.
Finish the Ritual.
Return the Crystals from the witch.
Finish 3 Hidden Object Puzzles in less than 10 minutes.
Complete a Hidden Object Puzzle without mistake.
Find 30 collectables.
Complete a Hidden Object Puzzle in less than a minute.
Find the Dragon Crystals.
Open the library.
Complete 5 Minigames without skipping them.
Complete a Minigame in less than a minute.
Find 3 Hidden Objects within 3 seconds.
Complete a Hidden Object Puzzle without a hint.
Find one collectable.