Hello! "Leap of faith" is easy when u know how...At the very start of the level go left and glide off the end. Stick close to the building and the egg is on the ledge.
Also, i can fill in the blanks from the "skill points" list:
Molten crater - Sgt.Byrds challenge,drop all idol heads on the main platform.
Icy peak - supercharge challenge,land on the platform where the thief is stood.
Lost fleet - skateboard record time.
Fireworks factory - Agent 9s challenge,in the 1st room,look up and there is a red square in the middle of the ceiling.Shoot it to get a powerup.
Charmed ridge - land on the "impossible tower" next to Zoes platform after the 1st section.
Haunted tomb - in the small stream of water,swim under the platform into the "dark hole".
Hope this has been useful