Bluey: The Videogame

Can be done in Episode 2 at the Playground. Seesaws have book stacks on them, press to jump on the opposite side and again as the books land (like the trampoline achievement). You need to do this move for a collectible on a lamp post.

After finishing episode 2, go to your sticker book and head back to the playground. In the first park area where you saved Muffin there will be a dark blue seesaw. Simply jump on one end and the achievement should pop, if not you can hold A so it springs you up but it should pop way before that.
The red seesaw in the other area won't work for this.

If you need a little help with this you can use my video guide below which will start at this point:

Missable - This one can be gained in Episode 2 of the game and is missable.
In the same playpark where you rescued Muffin to get the Flamingo Queen Achievement, jump onto the end of the seesaw with no books on it and let the books bounce you up and down a few times and achievement will pop.

This guide will walk you through this achievement and all of the other 21 achievements in under 2 hours. Toast is Ready achievement starts at around 34:32 into the video. All achievement timestamps are shown in the video Description.