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