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