To get this achievement you need to come in first on an online championship. To get to the championships, you need to go to the online match menus. They require a minimum of 3 events. You can either search for a match and hope to beat the host and other riders isn't that good at the game or is willing to boost. But considering not that many people play Pure anymore, you'll probably go with the first option. Whichever way you decide, three Sprint events are quicker to complete than any other events and will score you a fast thirty points.