Take photos of 100 different cars for Horizon Promo.-20G

After the first few championships you will be told to take photos of all the cars at the festival. You enter photo mode by pressing up on the D-pad. You can only photograph each car once and there is a perk you can unlock that places an icon above any car you havent photographed to make this achievement easier. Cars can be photographed at any time whether it be free roam or during an event. An easy way to complete this is to enter photo mode at the start of each race where there will be 12 cars in view. This also makes it easy given that most events are broken up into classes so you are almost guaranteed to have 12 different cars in each championship event.