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