Here is the full list of all 12 Alex Kidd in Miracle World trophies - there are 9 bronze, 2 silver and 1 gold.
Collect all the items and finish the game.
Clear every stage.
Run out of lives in Janken's dungeon with less than $400.
Have a snack on the Petit-Copter!
Clear Stage 9 while on the Suisui Boat.
Lose rock-paper-scissors even while using a Telepathy Ball.
Defeat both giant octopi.
Enjoy a sky cruise in the Petit-Copter.
Ride through Stage 2 on the Sukopako Motorcycle.
Break 300 blocks with your fists.
Outrun a ghost!
Freeze in fear from breaking a Skull Block.