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: Niima Outpost
Blow up the Silver Lego Wreck at the back.
Shoot 3 birds
Jump the conveyor belt.
Dig out 3 droids with the force
Ride one of the big animals to open the box with the crack.
Part B: Niima Bombardment
Build a turret (story related) and blow up the gold lego crane. Open the dropped box with the strenght handles ability.
Blow up the Silver Lego water pipes and use Ackbar to dive for the Minikit
(Ackbar can be unlocked at the "Poe to the Rescue" Mission)
Take the SN-1F4 sand droid to clear a sand pile to the far left
Part C: Jakku Graveyard Flight
Shoot 4 gantries.
Clear 3 wrecks on the surface
It's hidden inside a pipe like structure. Fly inside to get it