Super Cloudbuilt

Go to the "Escape" level and make your way up to the first Checkpoint Flag. In front of you, a little to the right, stands the tower the trophy description is referring to (this level's Life Key floats above it, by the way). Keep going past it and you will eventually have to climb up to a small platform, where if you look to your right, you will see the top of the tower. Jump on it, stay in the center and, without using your Jetpack, get into the right jumping rhythm so that you don't take any damage. Keep jumping until the trophy pops up. Here's a video: