Here is the full list of all 31 Sinless achievements.
Complete the first act
Check out the picture
Get a cornbun
Pop the Prog
Change the light
Play ghostface
Lose
Look carefully
Check newsfeed
Get a pearpod
Get an apple
Make bed
Start the trip
Get a Prog pro
Get something from Anne
Fix Poochie
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
Be annoying
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