Bluey: The Videogame

You can farm Keepy Uppy once you unlock it. Activities are repeatable for stars. You will also get this through natural progression, there's way more stars than costumes.

This one is gained by picking up collectables and completing tasks, each collectable fills up the star meter on top left of screen and gets you a new costume item each time the meter is full. If you are going to gather in all of the collectables this will pop for you by default before you've even managed to get them all.

This guide will walk you through this achievement and all of the other 21 achievements in under 2 hours. Fancy Ladies! achievement pops at around 1:24:42 for me. All achievement timestamps are shown in the video Description.

In the top left corner of your screen, you will notice you can gain stars which will give you hats. Collect all the hats to gain this achievement. To get the full amount of costumes you will need a total of 66 stars.

There's 2 ways to do this, you can either repeat a minigame and that will give you up to 3 stars each game or you can gain this naturally when playing the story. As you go through the story you will find collectibles which will each add 1 star to the top left, if you collect all collectibles as you go then you should have gained enough stars for this achievement when you hit the Beach. If not you can always go back for collectibles in each zone at the end as you're going to need them anyway if you plan to 100% the game.

If you need help with this, my video guide below will guide you through everything and show you where every collectible is so you can gain this achievement. The video is also time stamped if you want to skip straight to the collectibles on each level: