Anyone finished "Inspiration by My Side" achievement/course? (iridescent eureka)

It is the "collect iridescent eureka" course.

I am only on page 2 out of 3, and I wonder if anyone has finished it and if so, how many eurekas it took? I know it's RNG, but I am curious.

I myself have 60 max level eurekas and have only managed to get 3 iridescent eurekas so far (page 2 of the achievement require 5 iridescent ones, how many does the last page need if anyone has reached it?)