Tip: When having to use your GrabPack try to be as accurate as possible so you don't have to waste any unessesary uses.
The best way I found to do this is to not use your GrabPack unless you absolutely have to, you can interact with doors simply by walking up to them and pressing X, also you can grab the keys Ollie sends you by doing this.
When you get to the part with the Smiling Critters in the Playhouse don't use your flares, just simply make your way to the blocks and pull them down onto the buttons ( as, you will be able to save a lot of GrabPack hand uses)
you might die a couple times but it's fine as you will simply respawn in the middle of the Playhouse with your progress saved if you had already placed a block on the button. Then simply do the same on the other side. continue on through the game utilizing your GrabPack as little as possible, then once you make it to the CatNap Chase and go up the lift to the final boss area the Achievement should pop. ✨