Here is the full list of all 18 Blackwell Deception achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Finish the game in commentary mode
Abuse an innocent
Use Joey's breath ability on at least 10 people
Find all the references to previous games in Rosa's apartment
Complete the game once
Come back from the void
Free Rosa
Not bad, for a dead guy
Find Jamie's favorite song
Use Rosa's business card for an unintended purpose
Visit another psychic
Find a lost item
Sometimes you've gotta rob a few old ladies...
Get out of a sticky situation
Escape the yacht with only getting shot once
Save a ghost... and yourself
Use both Rosa and Joey to solve a puzzle
Open the secret compartment on the first try