Defeat Giga Gaia with the use of single-target damaging techs and not destroying the arms (no triple techs; no deaths; no fire and shadow-absorbing equipment equipped on any characters; no New Game Plus)
Clear the Sunken Cave and agree to help Fiona recover the forest with only Robo, Lucca, and Frog in the party (no fire or shadow protection armor; no New Game Plus)
After reaching the End of Time, but before entering Medina Village, get to at least the Nizabel round of the battle mode of Lavos before falling and witnessing a tragedy (L<=12; no New Game Plus)