No missable achievements (plus 35 unknown)
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Defeated your first Monokuma.
Finished the Prologue.
Collected 100 Monocoins.
Played a MONOKU-MAN machine for the first time.
Found your first book and saw your first bonus conversation.
Found your first Reference Book.
Escaped the collapsing bridge.
Finished Chapter 1.
Found your first Hidden Kid.
Defeated 100 Monokumas.
Raised Komaru to level 20.
Handed over your first Hit List to Hiroko.
Finished Chapter 2.
Defended the secret base from attack.
Cleared the Motivation Machine event.
Finished Chapter 3.
Komaru vs. Genocide Jack cleared.
Defeated every type of Monokuma.
Finished Chapter 4.
Finished Chapter 5.
Finished all chapters.
Found half of the Bling Bullets in the game.
Found every page of the Socki the Sock book.
Maxed out Genocide Jack's scissors.
Earned a B in every chapter.
Collected 10,000 Monocoins.
Found all of the Hidden Kids.
Earned an A in every chapter.
Defeated 1,000 Monokumas.
Found all Reference Books.
Found all of the Bling Bullets in the game.
Found all Scrap Notes.
Handed over all Hit Lists to Hiroko.
Raised Komaru to max level.