Here is the full list of all 31 Sinless achievements.
Fix Poochie
Get something from Anne
Complete the first act
Be annoying
Check out the picture
Pop the Prog
Lose
Look carefully
Play ghostface
Check newsfeed
Change the light
Get an apple
Get a pearpod
Make bed
Start the trip
Get a cornbun
Get a Prog pro
Use a prog hack
Fix the cyberslut
Use a levelhack
Not dress properly
Look at yourself
Get 10 kills in mojojoe
Get a score of 5000 in Ghostface
Have a "dead end" conversation
Complete the second act
Complete the third act
Read all the news
Get 30 kills in mojojoe
Get a score of 12000 in Ghostface
Beat the game