Here is the full list of all 18 Message Quest achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Persuade the King of Bards.
Meet with Yorick.
Tell a story that nobody's heard before.
Everyone needs to try it.
Survive the Innkeeper's attack.
Merge roads for the first time.
Take the scroll.
Find the first princess.
Sit on the Responsibility Stool.
Find the second princess.
Defeat Laziness.
Become a true hero.
Save the refugees.
Make yourself useful.
Get all the answers.
Restore the banner.
Put together the scroll.
Resist temptation.