There are a bunch of different kinds of vehicles in this game, and some are easier to find than others. After getting 12/90 gears in Land Race Challenges, you unlock a Gear MOD that notifies you if you're near a car that isn't in your rebel drop list. It works the same way that the collectibles around the map work, with that little radar thing at the bottom. When you have the time, just stand around a garage and wait for cars to pass by that you don't have, and then turn them in. However, there are certain vehicles that are either hard to find, have prerequisites to moving them to a garage, or are just in the middle of nowhere. Here is a video showing the location of eight vehicles that give people the most trouble, using some of MePixxel's strategies from TrueAchievements.
Once you've finally taken all the vehicles, you will officially have become the very best, like no one ever was. This doesn't require vehicles unlocked through the story, just vehicles listed in Garage Blueprints in the menus. Those said vehicles from the story will give you Earth, Wind and Sea naturally.
And if you become a car-catching champion and unlock all of the weapons on top of that, you'll get this elusive trophy. This does require you to finish the story to unlock the Urga Mstitel, as well as all the collectibles and performing all the stunt jumps.
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