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.
Say "No!" 999 times.
Design your first character.
Let someone pay for parking tickets.
Subscribe to the Coaches Channel.
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.
Complete chapter 3.
Make fun of 10 workers.
Win a Staring Contest Fight!
Complete chapter 2.
End ten encounters without saying No.
Deliver Grahams letter.
Say "No!" 99 times.
Complete chapter 1.
Play Alex' new video game.