SPOILERS || Quest support

[Virida]

Is there a walkthrough for all the quests? Because the wiki says a Stranga Sciuro adult is among the rewards for the second quest, but I apparently didn't do what I needed to do to get it, because I didn't get it, and I am EXTREMELY dismayed.

Not that I know of, no. I only made notes of stuff that is needed to finish the quests because I think the rest is up to players to explore. If it is a consolation, none of the critters you can gain from the quests are unique to those quests, they are all colourations that can also be gotten from the cupboard.
To get the sciuro you´d have to have investigated the strange noise and helped the critter btw.