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