Here is the full list of all 42 Pleh! achievements.
The base game contains 41 achievements, and there is 1 DLC pack containing 1 achievements.
Push the chair 1500 times
Push the chair 500 times
Demotivation
Find all 10 hidden transcripts
Please leave me alone
Dullness
Thank you VERY much for playing!
I bet you think you're so funny.
Carry on.
I respect your wishes.
Sing happy birthday twice
Agony
Consider this your final warning
I AM EVERYWHERE
Type "null" when null
I wish we could stay like this forever
This door was not one of them
10.17
Cracked the mainframe
If you're reading this, BIOSener.config installed correctly. If you're not reading this, BIOSener.config did not install correctly
Afterlife
Depression
Quit the game at the warning screen
Misery
Thank you for watching the credits!
I should have known.
Anxiety
Please don't take me away...
A clock, a piano, and a girl. What do they all mean?
Remember to wash your hands!
Desperation
Stop taking them away from me!
Push the chair 100 times
Push the chair 50 times
Push the chair 10 times
Suicide
Walk backwards for 10 seconds
Disappointment
Please come back...
Beat Pleh!
Press H to begin
Complete the new content update