Defeat Warrior of Light, Firion, Onion Knight, Cecil, Bartz, Terra, Cloud, Squall, Zidane, Tidus, Shantotto, Vaan or Lightning on all difficulties.

Unlockable	How to unlock
Testament to Acumen	Defeat Shantotto on all difficulties.
Testament to Allegiance	Defeat Cloud on all difficulties.
Testament to Conviction	Defeat Tidus on all difficulties.
Testament to Heroism	Defeat Warrior of Light on all difficulties.
Testament to Impudence	Defeat Vaan on all difficulties.
Testament to Knavery	Defeat Zidane on all difficulties.
Testament to Knighthood	Defeat Cecil on all difficulties.
Testament to Leoninity	Defeat Squall on all difficulties.
Testament to Mulebrity	Defeat Terra on all difficulties.
Testament to Rectitude	Defeat Firion on all difficulties.
Testament to Refulgence	Defeat Lightning on all difficulties.
Testament to Wanderlust	Defeat Bartz on all difficulties.
Testament to Youth	Defeat Onion Knight on all difficulties.