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