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: Oscillator Bombing Run
Shoot 5 green turrets
There is a Minikit in a hoop while flying.
Do the race
Shoot 3 red knobs at the section with the red pipes.
Part C: Oscillator Interior
Melt the ice block with the Flametrooper and use Ackbar for the dive
(Unlock Ackbar at the "Poe to the Rescue" extra mission)
Build 3 snow men
Shoot 6 targets at the back.
Grapple on the tree. Pick up the Minikit with the character that is fighting Kylo.
Open the cracked Lego
Down at the cracked Lego. Jump to the right, walk through the toxic area.
Build a snow ball, climb it and jump up.