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