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