Splasher

For this achievement, as mentioned in the description, you need to complete the level Big Bounce Theory, which is the level 15 in the game, without jumping.

The only way to achieve that is by using the "Bouncink" ( yellow paint ).
In the level you will be stuck on the ceiling a few times, there are 3 ways to get off it :

- With a regular jump, which is obviously forbidden in this case.
- With a bounce ( yellow paint ).
- By spraying water at the ceiling.

I recommend the later if you're not used to the game yet, by spraying water it will give you more time to adjust the fall.

Once you know that it's pretty much self explanatory, also while I'm not 100% sure, I believe you can die as many times as you want.

Here's a clip of me redoing this achievement if you want a visual idea.