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