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