Here is the full list of all 21 Wonder Boy: Asha in Monster World trophies - there are 5 bronze, 7 silver, 8 gold and 1 platinum.
Obtain all trophies.
Speak to the Magic Merchant.
Clear the game to the very end.
Obtain all shields.
Obtain all weapons.
Obtain all bracelets.
Collect all the Life Drops.
Read the "Welcome to Monster World!" message.
Bring the Queen back to her senses.
Save the Wind Spirit.
Save the Sun Spirit.
Wash your face with the water from the Pyramid springs.
Save the Moon Spirit.
Save the Earth Spirit.
Use the vending machine 30 times.
Perform three Downthrusts in a row without landing on the ground.
Get exactly 777 gold. There's a bonus in it for you as well!
Reach 0 hearts with an Elixir in hand whilst Pepelogoo is around.
Enter the original hidden code.
Tripped up right from the get-go!
Obtain the Magic Lamp.