This is a story related trophy and cannot be missed.
Just before completing the tutorial Yen Sin's Lab, you will come to a painting of a treasure chest. You will be asked if you will paint the world or thin it into nothingness. Paint the chest and you will be able to open it and get your first pin.
I have included a video for this level just in case anyone needs it. It's for the Wii version but I can confirm that it's the exact same. All credit for the video goes to Zero1Crisis.
On a side note, during this level you can also earn
Please vote positively if this guide was helpful and feel free to leave a comment if I can improve it in any way.