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