Whoa! That's High! Trophy in Skylanders Imaginators
Whoa! That's High!
Earn 20 Objective Stars
How to unlock Whoa! That's High!
After I was done with the campaign, I had 18 stars and I did skip as much stuff as possible. If you save this for last, you can easily use Sensei realms to get another 1-6 stars. If that is not enough you can replay earlier levels for more.