No missable achievements (plus 30 unknown)
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Tredun joined your party.
Won the first battle of the game.
Defeated the first boss.
Flappy joined your party.
Traveled to all regions in Andoran
Brought the mother mammoth and her child back together
Defeated the Giant.
Catalina joined your party.
Learned all of the abilities
Escaped from the Cold World
Captured 20 Fish
Defeated the Ritual King
Defeated the Heart of Nothing
Passed all of the memory puzzles in Scum Cavern
Defeated the Revived Ritual King
Used the Bacun Tune to sneak into the tower
Captured 50 Fish
Captured 100 Fish
Picked the lock on all of the chests
Defeated General Wit-Geraldo
Beat the entire game without dying
Maxed out all of Chadrick's technique points.
Maxed out all of Flappy's technique points.
Maxed out all of Rowan's technique points.
Maxed out all of Tredun's technique points.
Maxed out all of Catalina's technique points.