Here is the full list of all 22 Say No! More achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Say "No!" 99999 times.
Say "No!" 9999 times.
Become the Staring Contest Champion!
Let someone pay for parking tickets.
Play Alex' new video game.
Say "No!" 999 times.
Subscribe to the Coaches Channel.
Deliver Grahams letter.
Complete the story.
Complete chapter 7.
Complete chapter 6.
End ten encounters without saying No.
Complete chapter 5.
Complete chapter 4.
Complete chapter 3.
Win a Staring Contest Fight!
Complete chapter 2.
Make fun of 10 workers.
Complete chapter 1.
Say "No!" 99 times.
Don't hurt the janitor imp!
Design your first character.