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