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.
Good Ending.
Pesky birds!
Can type texts to the images.
Bad Ending I.
Bad Ending II.
Normal Ending.
Be a true professional!
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.