This requires you to gather 30 of the 145 Pagies in the game.
There isn't really a specific order that you can get them as you can play the game in many different ways, though I unlocked mine without having to expand any worlds and getting all the Pagies I could before moving on.
My totals when I unlocked this was:
Hivory Tower: 8
Tribalstack Tropics: 11
Glitterglaze Glacier: 10
Moodymaze Marsh: 1