Ben 10

The Canyon is a stage that can either be pretty easy to finish in under 15 minutes or a little more difficult depending on your platforming and fighting skills. There are a bunch of spots that will require either Overflow or Stinkfly to get across, plus there are a bunch of smaller platform jumps you must make as well. The robot enemies in this stage are also much stronger and resilient that most previous enemies you have faced. To make the fights against them easier, since the majority of them are fought on cliffs, try to knock them over the edges to kill them instead of knocking them out via normal fighting as this will save a lot of time.

As always, you will want to make sure you avoid anything that you don't need to be doing in order to advance yourself in the level. Don't bother breaking boxes, exploring, upgrading or fighting with enemies that won't release you from the energy barricades. I would use someone like Grey Matter for the majority of the stage as he is very quick and can get you through it fast (if you want to use someone else to battle during the stage in the required fighting parts that's fine). Once you finish The Canyon in under 15 minutes, the trophy will pop.

Video Guide