No missable achievements (plus 41 unknown)
Sign in with Steam or Xbox to track your progress, and:
Refute an argument.
Present false evidence.
Find a hidden Monokuma.
Achieve the highest level bond with someone.
Shoot down over 500 white noise.
Slap around objects at least 1,000 times.
Achieve the highest level bond with everyone.
Find every hidden Monokuma.
Collect every present.
Achieve the maximum level.
Unlock the entire gallery.
Obtain all achievements.