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