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