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.
Synthesize all Dragon Stone weapons.
Raise all of any one character's skills to max level.
Learn every skill.
Unlock all bestiary entries for all non-boss, non-titano foes.
Synthesize each Spirit Elixir at least once.
Buy every item from the Zanzibar Firm.
Defeat all titanos.
Find all the missing pikkards.
Conquer the Moon Dragon, Ze-Kalion.
Conquer the Sea Dragon, O-Balon.
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.
Escort Tia back to Altago City completely unscathed, and without using any healing items.
Die by drowning.