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