Anyone have an optimal route to unlocking everything as fast as possible?

[PewPew]

Gonna carry my friend through coop, but they just got the game, and I remember having to google a lot to unlock items. Is there a guide out there that makes the process super easy and efficient?

[Sea Base]

https://steamcommunity.com/sharedfiles/filedetails/?id=3078101989
Not a guide to optimal route, but it does make planing out how to get to the next thing your friend needs real easy and quick.