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