Here is the full list of all 21 Nothing achievements.
You wasted one minute of your life doing nothing
5 minutes of your life
Good Work!
Things are getting serious
Well done!
You can count to three
You are a true Hero!
Nothing can stop you!
Or 24 hours, it's the same
Maybe you're the choosen one!
Half Life 3 Confirmed
Say goodbye to your mental health
You really go for everything
Level: Hardcore
You did it, you crazy son of a wonderful mother, you did it!
Only a few can do nothing for a week, you are a legend.
You smashed 200 keys! Consider going to therapy
Are you scaring me, are you okay?
You took this seriously, and here is your reward
You are a legend! But it is seen that your mental health no longer exists, we will pay respects
You have been blessed by the power of our god and savior gabe.