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