Here is the full list of all 38 Secret of Mana trophies - there are 26 bronze, 7 silver, 4 gold and 1 platinum.
Earn all trophies
All weapons at level 9
Complete the guide
Reach the ending
Defeat Mana Beast
Defeat Dark Lich
Defeat all monsters
Obtain all torso gear
Obtain all head gear
Defeat Dread Slime
Obtain all arm gear
Defeat King Vampire
All magic at level 8
Defeat Blue Dragon
Visit all locations on Flammie
Defeat Mech Rider 3
Defeat Kettle Kin
Defeat Aegagropilon
Defeat Shadows #1, 2, & 3
Defeat Dark Stalker
Defeat Gorgon Bull
Defeat Lime Slime
Defeat Mech Rider 2
Defeat Vampire
Defeat Minotaur
Defeat Frost Gigas
Defeat Boreal Face
Defeat Mech Rider
Defeat Great Viper
Defeat Spring Beak
Defeat Jabberwocky
Defeat Kilroy
Defeat Wall Face
Defeat Fire Gigas
Defeat Biting Lizard
Defeat Spikey Tiger
Defeat Tropicallo
Defeat Mantis Ant