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