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