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