Porgy Map

Area 1

Area 1+2

Full map

Tip: If you have entered the third area and you can't see anything, you don't have the right item

Secrets

You can also find these yourself once you have all of the items!

Some require blowing up walls with Depth Charge (but try shooting the wall/rubbing against it first)

Source

This guide is based on information from the original source: Steam Community Guide.