Disneyland Adventures

The blaster is used to shoot most of the light fixtures. Either street lights, pathway lights, side of buildings lights, and some flames/torches. You will not see a red lazer target, you just aim at the lights and a white dot will show up in your target.
Does not work with small world colorful stage lights on pathway and some other lights.

In frontier I blastered a box of fireworks so maybe it's for more than just lights. I only shot lights and it popped for me.

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-Update 2023-

u/uberJames recommends that you thoroughly work area by area getting all collectables instead of trying to just do 1 collection at a time, this is logical and likely the fastest way to get all collectable related achievements.

u/GamePadZebby says; 50% means 100% of half of the secrets, not 50% of the total number of interactions in the park as a whole. I.e. you must complete a set (such as monorail lights in Tomorrow land) for it to count towards the percentage completed but missing one in every set is equivalent to having 0% completed. They agree with uberJames that being thorough in each area will greatly benefit you.

Thanks for these helpful contributions!