No missable achievements (plus 58 unknown)
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You played a new game.
You traveled to Mist.
You acquired one summon.
You obtained one augment.
You raised Cecil (Dark Knight) to level 15.
You defeated 100 enemies.
You traveled to Damcyan Castle.
You completed 10% of the Bestiary.
You raised Cecil (Dark Knight) to level 20.
You defeated the Sahagin that attacked at Kaipo.
You defeated Mom Bomb.
You were shipwrecked by Leviathan.
You earned 10,000 gil.
You defeated Scarmiglione.
You raised Cecil (Paladin) to level 10.
You talked to everybody in the Training Classroom.
You defeated 500 enemies.
You raised Cecil (Paladin) to level 20.
You raised Cecil (Dark Knight) to level 25.
You defeated Cagnazzo.
You completed 30% of the Bestiary.
You defeated Dark Elf.
You raised Cecil (Paladin) to level 30.
You earned 50,000 gil.
You defeated the Magus Sisters.
You defeated Barbariccia.
You defeated Calcabrina.
You defeated 1,000 enemies.
You defeated Dr. Lugae.
You raised Cecil (Paladin) to level 50.
You defeated Rubicante.
You completed 60% of the Bestiary.
You defeated Demon Wall.
You went to the moon on The Lunar Whale.
You earned 200,000 gil.
You defeated the elemental archfiends.
You defeated the CPU.
You obtained Excalibur.
You raised Cecil (Paladin) to level 70.
You finished the game.
You acquired all summons.
You talked to everybody in the Developers' Office.
You earned 500,000 gil.
You obtained Ragnarok, Holy Lance, Murasame, and Ribbon.
You defeated 2,000 enemies.
You obtained 20 augments.
You traveled across the entire map.
You finished the game on Hard difficulty.
You played through all Namingway events.
You obtained Adamant Armor.
You obtained all the Onion items.
You obtained all augments.
You acquired all hidden summons.
You finished the game twice.
You defeated Geryon.
You defeated Proto-Babil.
You completed the entire Bestiary.
You earned all achievements.