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.
Complete chapter 1.
Complete chapter 2.
Complete chapter 3.
Complete chapter 4.
Complete chapter 5.
Complete chapter 6.
Complete chapter 7.
Complete the story.
Play Alex' new video game.
Say "No!" 99 times.
Say "No!" 999 times.
Say "No!" 9999 times.
Say "No!" 99999 times.
Win a Staring Contest Fight!
Become the Staring Contest Champion!
End ten encounters without saying No.
Subscribe to the Coaches Channel.
Deliver Grahams letter.
Let someone pay for parking tickets.
Don't hurt the janitor imp!
Design your first character.
Make fun of 10 workers.