There are 24 different graffiti collectibles in Hi-Fi Rush in total. You can find some of them in your first playthrough, and the remaining can be found after you beat the game. The reason for that, some places in the early chapters are locked, and you can't access them because you don't own Macaron and Korsica yet.
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After you collect all of them, you can get a rare achievement and a bunch of Gear while doing that. As you put every piece of graffiti on the wall in the Hideout, you earn Gears.
Track One: A Fresh Start - Graffiti One
You will need Macaron and Korsica to collect this graffiti. This graffiti is located in track one, but you can't access it in your first playthrough. After you pass the trash-pressing machines, you will find an armored door that only Macaron can break.
Behind this door, there is also a generator that only Korsica can run. After running this generator, you can find this graffiti on top of this place.
Track One: A Fresh Start - Graffiti Two
Graffiti one and two are close to each other. Shortly after you collect the first graffiti, you will reach a place called QA Check. Before you enter that door, make sure you jump on the platform next to the entrance. After you jump on that platform, you can see the flaming door on your left.
After extinguishing the fire at the entrance with Korsica you will be able to find this graffiti.
Track Two: Power Up - Graffiti Three
There are three pieces of graffiti in track two. You will have to wait for your second playthrough for this one too. Shortly after you use your magnet arm, you will fight a bunch of enemies, and you can see a place you can hook on your right.
Grapple there and extinguish the fire with the help of Korsica, jump down to pipes, and follow them.
Track Two: Power Up - Graffiti Four
After you collect graffiti three, proceed on your way, and after you climb up with circle platforms, you should break the boxes on your left that block the entrance. You will find the graffiti four on top of that room.
Track Two: Power Up - Graffiti Five
Graffiti five is located just before the Rekka boss room. After you fight with a group of enemies, you will find a four-times launch pad. Then you will find yourself in a vent. After you push the button and jump down, turn left toward the cleaning bots. You will see Rekka's graffiti on the right wall.
Track Three: Trial By (Volcanic) Fire - Graffiti Six
Graffiti six can be obtained after you complete the story. This graffiti is located on track three, and you can find it shortly after you confront with motorcycle enemy. You reach a doorway that you can open with the help of Macaron.
After you enter this room, go to the top, and you will see graffiti six on the ground.
Track Three: Trial By (Volcanic) Fire - Graffiti Seven
Graffiti seven can be found towards the middle of track three. When you reach the R&D Department entrance, turn right and proceed behind the golden Kale statue. You will see graffiti seven there.
Track Three: Trial By (Volcanic) Fire - Graffiti Eight
This graffiti is located on track three. As you continue on your main path, a door will be hacked and closed, then someone will open the door on the right side for you.
Press the button, and enter the vent. When you come out, jump on the hatch of this vent, and you will find Zanzo's graffiti.
Track Four: Less Budget, More Problems - Graffiti Nine
This graffiti is located on track four, and you can find this graffiti after you reach a room with a lava tube in the middle. After you see this tube, break the boxes on the back left side, and there is your graffiti.
Track Four: Less Budget, More Problems - Graffiti Ten
After entering the AR Labs, you need to disable an eyeball, and after that, you will walk through the path made by the impact of the blast. Turn left at the first turn on the road.
