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 ;-) :
Character: Chritauri Tourist
Right at the start, go behind the monster's spine.
Destroy 6 big purple lights
Detect a hidden area with Black Widow and use telekinesis to open the lid with Vision
Shoot the silver cage with Hawkeye
Part B -- Video Time 01:02
Character: Captain America (Bucky) -- Video Time
Grapple that Newspaper box with Hawkeye.
Smash the broken wall with Hulk or Thor, get the Minikit that is inside.
Shoot the golden elevator part with Ironman and fly up to get the Minikit.
Shoot the window with Hawkeye and jump into the office to get the Minikit.