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