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