Toybox Turbos

In a countdown event you have to collect clocks while racing around a track, making sure to avoid any mines that will disrupt your progress. With each clock you collect, a handful of seconds (varies depending on the event) will be added to your timer which gradually counts down as you progress. In the easier events you have some margin for error but in the harder ones missing more than a few clocks is enough to miss out on 3 stars. Once you have earned 3 stars in a countdown event for the first time, this trophy will unlock. The first countdown event you should come across will be 'Breakfast Time' - the second event in 'Service Sprint' - and so this is most likely where you will get it.