Completed Quests:
Success, Khardrath's Planar Sanctum: Investigate Malikoth's disappearance
Success, Keep of the Righteous: Infiltrate the Keep for Kylos
Success, Violet Woodland: Mysterious Runes
Success, Hamsah Mu'tazz: Habib's Rat Problem
Success, Hamsah Mu'tazz: Reagents for Keiiah
Success, Udgaard: Deliver Saldria Horseshoes
Success, Academy: Fine Leather Gathering
Success, Academy: Simon's Delivery Quest
Success, North Road: Kariliun's Will and Note
Success, Aldevari: Gralan's First Task
Success, Aldevari: Gralan's Second Task
Success, Hamsah Mu'tazz: Completed the Mosaic
Success, Moudrilar's Monastery: Feristle's Lecture
Success, Moudrilar's Monastery: Qendriko's Meditation
Success, Tower of Sorcery: Membership
Failed , Feanwyyn Weald: Margoesh the Poor Adventurer
Success, Coastal Wetlands: Bring back Jeldowan's sacred acorn
Success, Felar Encampment: Retreive the felar chief's necklace
Success, Ar'atouldain: Retrieve the diamond tiara for the wood-elf King
Failed , Underdark: House Nel'zikahn
Failed , Prison of Glymarach
Failed , Felar Encampment: Retreive the felar chief's necklace


As you can see, I have both faithed and completed the quests for Glymarach. Though in the fail column I have an actual "Failed, prison of Glymarach" and no succession matching it - despite having the three quests COMPLETED as well.

So, to test, because it seems you can repeat the quest(possibly infinitely? That'd be sweet).

Get the quests. Complete the quests. Stay below 35.
Go back to the Felar chief, say YES - suddenly the quest you have completed comes up as in progress, again, in your quest listing.