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