Full list of all 12 Heroes Trials achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox One.
Interacted with the Adel and Soreon statues.
Defeated Potako.
Acquired the three magic spells.
Cleared Plonida shrine.
Buy the boots.
Defeated Denmaku.
Defeated Taurus.
Get the bombs.
Cleared the first trial.
Killed an enemy.
Found a fruit or vegetable in the island.
Talk to a NPC.