First of all it should be mentioned that this is the only missable Trophy in the game. It takes a little work but nothing too serious.
In order to get to where you have to be you have to collect all 8 ribbons in Pinwheel Industrial first. I found you a sweet little video guide for that:
Video credits to
AMDM-61 on Youtube.
As soon as you have them all you will get a message that you can access the levels' core memory in The Case now. Do that. Take all the core memory photographs and then exit through the glowing door. This will bring you to a mine with smaller crystals. After you have taken care of them with the lamp (which you can also find in Pinwheel Industrial) you'll move on and eventually arrive at the starting location of the game. You see a huge crystal in front of you which you have to walk past and then downstairs where you will find the desk with the bell on it. Simply ring it and...
KACHING! Trophy unlocked.
Thanks to
Prem-aka-Prince for contributing to this solution.