Here is the full list of all 21 Ys SEVEN achievements.
Complete the game on any difficulty.
Complete the game on Nightmare difficulty.
Obtain all other achievements.
Escort Tia back to Altago City completely unscathed, and without using any healing items.
Raise all of any one character's skills to max level.
Synthesize all Dragon Stone weapons.
Buy every item from the Zanzibar Firm.
Synthesize each Spirit Elixir at least once.
Unlock all bestiary entries for all non-boss, non-titano foes.
Learn every skill.
Defeat all titanos.
Conquer the Moon Dragon, Ze-Kalion.
Conquer the Sea Dragon, O-Balon.
Find all the missing pikkards.
Conquer the Wind Dragon, Mu-Anti.
Conquer the Flame Dragon, Angue-Barl.
Conquer the Earth Dragon, Rada-Manj.
Survive against a beast intended specifically to kill you.
Defeat Geis in one-on-one combat.
Die by walking over thorns.
Die by drowning.