Here is the full list of all 12 One Manga Day achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Normal Ending.
Can read and correct texts after translator.
Can purify pages, make them clean.
Can translate some texts from language to language.
Be a true professional!
Can scan new pages for the team.
Good Ending.
Pesky birds!
Can find out prerelease shortcomings.
Bad Ending II.
Can type texts to the images.
Bad Ending I.