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