Need some help on a Quest list bug
Im currently on my last of the five games, Utawarerumo: Past and Present Rediscovered, and I want to get the plat trophy. I'm currently in chapter 10 where we need to head to Gilgajarna volcano in the main story and here's the problem, one quest among those I've completed ("Flowers for a Grave") is not among the supposed 19 as of the moment.
I know that I succesfully completed the quest sceneario and requirements as I currently have the Fortress form of Halu, which is technically a quest exclusive reward from the the robot. For context, I remember completing the quest the moment the ruins became available to me prior to entering Auyatawna, which I believe shouldn't be a problem. Will there be any repurcussions ? Heck, I wonder if its even part of the list of quests as it may be not be considered one. Any ideas on how to deal with this as I don't want to revert to a previous save given the numerous completed areas I have explored and the levels I have accumulated for the party :(
For context, given that there is no walkthrough guide in GameFAQ for this game, I used a google sheet link which technically serves as a tracker of all kinds of things for the game made by a redditor and found "Flowers for a Grave" as one of the quests
PS: I know it's kinda idiotic and sort of not (?), but I asked AI for a solution from which it stated one of the options is to use Steam Achievement Manager (SAM) to somehow forcibly unlock a steam achievement (presumably after I finish the game). Is this doable/legit ?