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