This is a bit of a minimalist guide but the process should be pretty self-explanatory with a few hints.
-Each district of the city has a crime wave, 10 in total. These crime waves once complete provide a Pixar Build for you to complete. These builds cost 5 Incredibricks to complete and are the common button mash. They show up on the mini map with a blue ball instead of the i.
-The Pixar builds provide you with a small puzzle that the unlocked character can accomplish. Once that puzzle is solved, you are able to collect the red brick and check it off your list.
-The crime waves only account for 10 of the 12 Red Bricks. The remaining two are unlocked at the end of each movie. Repeat, You must complete all 12 chapters to unlock the remaining 2 Red Bricks after the crime waves.
BUG NOTICE: That 3rd hint isn't provided in too many places and will be the biggest hindrance if the game feels like glitching for you (like it did for me). I do not have this achievement even after collecting all 12 because of an issue that involves rest mode and keeping the game open. This bug only comes into play when you resume play from rest mode and unlock the final red brick. So as a best practice, QUIT out of your game if you make use of rest mode for your Xbox. Do NOT resume play on a game that's been open from a previous session and make sure you freshly log into your account each time you play. Not doing this might cost you another 8 hours of play time with crime waves and story mission.