Here is the full list of all 30 Detective Jackie - there are Mystic Case achievements.
Finish the first level
Reveal the hidden painting of Medusa
Finish the 1st day of the investigation
Find a lead on a secret organization
Finish the 2nd day of the investigation
Find a secret passage
Finish the 3rd day of the investigation
Finish the 4th day of the investigation
Discover Chloe's murderer
Finish the 5th day of the investigation
Finish the 6th day of the investigation
Unlock the first Ring God symbol
Reach the final upgrade of the Ring God symbol
Call 300 clients
Complete 30 missions
Tap on 40 question marks
Serve 2000 clients
Link 10 clues together
Speak about the mysterious ring with Eduardo
Discover the approximate date of the stained glass
Speak about the relationship between Chloe and her stepmother
Mention the fact that you have doubts about the cause of your house fire
Mention the secret organization lead to Vanessa
Describe the secret organization’s outfit to Gary
Discover a secret book named "The Lifeless Book"
Consider that Aysha has the same persuasive ability
Tell Michael you want to stop Ophis
Understand the reason why Ophis needs you
Succeed in convincing the statue
Complete all the Ring God’s symbols