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: Endor Shield Generator
Right at the start. Either jump up to the right or build a trampoline.
Get up to the tree with hatches and push down the crate. Use the parts to build a climbing frame to the left.
There is a bee hive hanging on the tree after the shootout. Use the force to get it down.
Break the AT-AT with the command and hatches abilities. Then build an elevator with its parts to get up the tree.
Use the same parts to build an elevator to the right. Get up and use Ackbar on the pool. (Unlock Ackbar in the "Poe to the Rescue" Extra Mission). Build explosives on the tree, go through and build 3 music instruments for the Ewoks.
At the bunker, while still in the AT-AT, shoot the 3 Gold Rocks.
With the command ability, go get those 3 minions standing around and grapple open that box.
Part B: Death Star Throne Room
Blowup the Silver LEGO to the right, build a platform for BB8 and play the video game to the end.
Use the Dark Force on the handle to the left, then use someone with hatches to go through.
Part C: Death Star Attack
Shoot 5 turrets.
Shoot 3 Death Star Core supports.