Here is the full list of all 44 Trials of Mana achievements. It takes around 50-60 hours to unlock all of the achievements on Windows.
Obtain all achievements.
Defeat Dark Lich.
Become a master fighter.
Become a master guard.
Become a master swordsman.
Play with all six main characters.
Complete Duran's story.
Complete Kevin's story.
Complete Riesz's story.
Defeat Archdemon.
Purchase nitromyte for the listed price.
Defeat Black Rabite.
Learn all abilities as any character.
Become a master cleric.
Become a master thief.
Become a master magician.
Stop the end of the world.
Defeat Anise on hard.
Learn 20 abilities as any character.
Accumulate at least 500,000 lucre.
Complete Angela's story.
Complete Charlotte's story.
Complete Hawkeye's story.
Complete Chapter 6.
Defeat Mondoragon.
Find Li'l Cactus in all possible areas.
Max out magic pot level.
Complete Chapter 5.
Accumulate at least 100,000 lucre.
Open 200 treasure boxes.
Complete Chapter 4.
First ride on Flammie.
Complete Chapter 3.
Complete Chapter 2.
First ride on Vuscav.
First class switch.
Open 100 treasure boxes.
Complete Chapter 1.
First cannon ride.
First encounter with Li'l Cactus.
First time learning a chain ability from an unexpected acquaintance.
First time learning an ability.
First time learning a companion's chain ability.
First time planting a seed.