Completing the fish guide achievement

[visual locust]

What does it mean by that?

Like what do i have to do in order to complete it

[true trench]

all of the bars on the first page of your pls fish guide have to be full. So: challenges completed, variants discovered, creatures completed, and locations completed

[visual locust]

Ooh okay tysm 🥰

Are boss variants included?

[true trench]

you're welcome
yep, that includes the boss variants too. It's one of the most difficult achievements to complete