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