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.
Good Ending.
Can find out prerelease shortcomings.
Can read and correct texts after translator.
Can translate some texts from language to language.
Can purify pages, make them clean.
Normal Ending.
Be a true professional!
Pesky birds!
Can scan new pages for the team.
Bad Ending II.
Can type texts to the images.
Bad Ending I.