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.
Deliver Grahams letter.
Win a Staring Contest Fight!
Play Alex' new video game.
End ten encounters without saying No.
Subscribe to the Coaches Channel.
Don't hurt the janitor imp!
Complete the story.
Complete chapter 7.
Complete chapter 6.
Complete chapter 5.
Complete chapter 4.
Make fun of 10 workers.
Say "No!" 999 times.
Complete chapter 3.
Complete chapter 2.
Complete chapter 1.
Say "No!" 99 times.
Design your first character.