In order to complete Spyro The Dragon with 100% you have to unlock all trophies / achievements. In this guide we explain the following task to you:
Do a loop around an arch
The complete list of all trophies and achievement guides can be found here.
Loop around the bridges
You can only complete this trophy in Sunny Flight, this is a speedway level. To get there you have to find the secret entrance in Artisan's world.
If you are at the beginning of the Artisans world, go to the left and jump on the 5 golden jumping pads in the pond to unlock the Sunny Flight Level. Once you enter the level, aim for the train track arches. If you fly under the bridge, press R1 / RB to perform a loop around it. This unlocks the trophy.