There a site that highlights

Quests received off the environment?

Those quests that are off an interactable object in the field, has a orange glowing effect but there’s no yellow ! mark, like NPCs, so you could easily miss them – from the few I’ve done they yield a stat bonus at the end.

Has a pretty amazing interactable map if you haven’t seen it already ~

Doesn’t show the locations of quests I was referring to sadly.

Example, in Windbringer Hills (Arthetine), in the top right corner of the area from the Waste Facility there’s a scrap pile that starts off a quest chain that rewards you a bunch of Rare engravings, Cards, and a stat potion at the end.