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