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