Here is the full list of all 66 I·S·U achievements.
Welcome to the theater.
Go to the stage.
Start acting.
Sit in the chair.
Cooperate with others.
Don't be afraid of fighting.
Miracle may help you.
Miracle can't prevent fate.
Exit Underdog.
Exit All.
Fight again and again.
Take the time for practice.
Don't you like detonation?
Show the spirit of self-sacrifice.
Build a mountain of scraps.
Hit 5 times continuously.
Hit a heavy blow.
Meditate deeply.
Capture the other guys.
The dangerous hurricane comes.
Make everyone exit with an explosion and end it.
Take all Lessons.
Play Arcade mode.
Clear Arcade mode.
Clear Arcade mode as histoire.
Clear Level 5 Arcade mode as histoire.
Clear Arcade mode as fadia.
Clear Level 5 Arcade mode as fadia.
Clear Arcade mode as kokuzo.
Clear Level 5 Arcade mode as kokuzo.
Clear Arcade mode as iwan.
Clear Level 5 Arcade mode as iwan.
Clear Arcade mode as meaw.
Clear Level 5 Arcade mode as meaw.
Clear Arcade mode as pak-ssu.
Clear Level 5 Arcade mode as pak-ssu.
Clear Arcade mode as dan.
Clear Level 5 Arcade mode as dan.
Clear Arcade mode as dafu.
Clear Level 5 Arcade mode as dafu.
Clear Arcade mode as wunala.
Clear Level 5 Arcade mode as wunala.
Clear Arcade mode as suicida.
Clear Level 5 Arcade mode as suicida.
Clear Arcade mode as shanti.
Clear Level 5 Arcade mode as shanti.
Clear Arcade mode as steven.
Clear Level 5 Arcade mode as steven.