Here is the full list of all 16 HEROES TRIALS achievements.
Talked to all NPCs.
Completed the game without buying the boots.
Found the 3 rare fruits and vegetables of the island.
Completed the game in less than 120 minutes.
Completed the game in less than 90 minutes.
Completed the game with the highest rank possible.
Killed an enemy.
Cleared the first trial.
Defeated Potako.
Defeated Taurus.
Defeated Denmaku.
Bought bombs at the store.
Acquired the three magic spells.
Interacted with the Adel and Soreon statues.
Cleared Plonida shrine.
Obtained all trophies.