The first chance you get at unlocking this achievement is during "The Drivers Seat" case at the traffic desk. You will be given objectives thorough this relatively quick case, so I will just state every clue that must be found in this case and where they are located. Remember, you will get a nice little chime and then the music will stop to signify that you found all clues at a certain scene.
Main crime scene (5 clues)
-Check inside the car and look at the blood
-Live hog receipt in trunk
-Bloodied pipe found near the passengers side of the car
-Wallet on the ground near the front of the ground (Note: examine both the picture and the license.
-Glasses next to the wallet
Black residence (7 clues)
-Head straight into the house into a messy bedroom. On the left is a wardrobe that must be examined to find a train ticket to Seattle.
-To the right of the wardrobe, there is a dresser with a photo of Mr. Black on it. Pick it up and examine it further to find a secret love letter.
-Next to the photo is a glasses case
-Matches next to the bedside drawer in the messy bedroom. Examine them further to obtain a bar name, which you must call in to find the address for. There is a phone right across from the main door.
-In the kitchen that is to the left when leaving the bedroom, there is a Instaheat receipt on the small kitchen table.
-On the same table, there is a Instheat flyer. Examine the entire flyer and the back of it.
-Go outside and and go along the right side of house to come across a water heater. Fix the pipes to gain a clue.
After visiting Frank at the bar (1 clue)
-For this clue, make sure you yourself drive to the next objective in order to get the next clue titled "swine blood" from the APB during the car ride.
Frank's apartment (1)
-When you arrive at Frank's apartment building, go to the mailboxes to find Frank's room number.
After you finish the case, the achievement should unlock for finding all clues.