Fancy ladies! Achievement in Bluey: The Videogame

In the upper left corner is a meter that fills up any time you get a collectible, sticker, or complete a task. Every time the meter is full, you unlock a new hat (or costume, as the description claims). Considering you need to collect all stickers and play minigames numerous times, you will unlock all costume well before finishing everything else. This achievement will therefore come naturally as you complete your sticker book.