All Collectibles in order as they appear. The characters used are just examples. Of course, you can use whatever character you like with the according abilities ;-) :
Part A: Assault on Starkiller
In one of the hoops at the end.
Build a device abote the door with the red force field. Go through.
Hover over the gap, where you build the ladder. Open the door with dark force. Go inside.
At the agility climb go way up (story related)