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!
Bad Ending II.
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.
Good Ending.
Pesky birds!
Can purify pages, make them clean.
Can scan new pages for the team.
Bad Ending I.