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