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