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