LEGO Star Wars: The Skywalker Saga

Another easy level is the first one of Episode 1: A phantom menace, called: A bigger fish.
Just shoot the rockets to left & right besides the fishes. Minikits appear in bubbles. Very easy to hit. Maybe retry once more & the Minikits are yours.

When u got all the Minikits, it's a good level to farm studs, because the level is quite short & u get a lot of studs in replacement of the kits.

Have fun!

For those struggling to get all Minikits or are too inpatient to look around for them during the story, I find that the easiest level to get all Minikits in is Episode lX's second level "They Fly Now!". You'll see the Minikits being held by flying troopers or other amiable enemies that you can shoot at. This is where I got this achievement personally.