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