No missable achievements (plus 15 unknown)
Sign in with Steam or Xbox to track your progress, and:
Trick a Lancer into dashing down a pit.
Finish the game with the regular ending.
Defeat TM-061 without taking damage.
Complete the NPC's secret sidequest.
Defeat the Admiral without taking damage.
Find five very special treasures.
Learn to use Magic Breath.
Have 10,000 gold at once without depositing it at home.
Defeat the Bishounent without taking damage.
Find the Stannum Sollerets and all five gemstones.
Defeat Boudouin and Alex without taking damage.
Finish the game with the best ending.
Defeat the king's bodyguards without taking damage.
Get Dragon to whistle three particular songs.
Clear the game without increasing your HP from taking damage.