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