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.
Resist temptation.
Put together the scroll.
Restore the banner.
Get all the answers.
Make yourself useful.
Save the refugees.
Become a true hero.
Defeat Laziness.
Persuade the King of Bards.
Meet with Yorick.
Find the first princess.
Find the second princess.
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.
Sit on the Responsibility Stool.