Bestiary/Datalog?

[Anonymoose]

I have tried to look for a Bestiary/Datalog in this game, but I can't find one.

There's nothing of the sort in-game yet, but as more people latch on to the lore, SE gets more excited about adding things like bestiaries, expanded journals, and gear compendiums where we'd unlock "tome" / "library" entries for completing certain sets of gear or killing certain sets of mobs, or completing certain quest lines.

something that I can access in-game instead of consulting a wiki everytime I have a question. // How do you remember all this stuff?

Can't help you there - I remember all this stuff because I build personal libraries for use in wikibuilding, lol.