Hi all. I found a video that was very helpful to complete this dlc and very easy.
I did not fully read the Itzz Sh0wt1m3
user guide, but I think it's the same, although the video helps a little more; likewise I only try to help.
In your main menu you should create a tutorial world, omit everything by pressing B and the rest of the map will open for you.
Go straight up the stairs to the end and you will be where the video starts.
before arriving there look for foods like carrots and watermelons and just follow the video.
likewise you can unlock the other achievements related to dlc aquatic.
the video does not belong to me, but I thank the user Rimoxxy for the creation.