Two potential bugs, unless I'm missing a point somewhere.
After killing Abe and getting the copper amulet I talk to the trader Elkan. The quest never leaves my journal though. I can keep telling Elkan about it each time I start conversation. If I wear or sell the amulet the journal text resets as if I hadn't finished the quest until I remove or buy back the amulet.
The second Dungeon(under the forest thats is full of spiders) appears to be empty of monsters.
Well for one, it appears that who gives what quest is random. For a second thing, in regards to the Copper Amulet quest, I figured out how to bug it and how to make it work. The first time you get the amulet, don't touch it when it's in your inventory. Go to the NPC that gave you the quest, answer you have it, and the quest will go away. NEVER TOUCH THE AMULET AGAIN or the quest will re-appear in your quest book.
I have also figured out that one of those nonsense manuscripts gives you the Archery quest. This quest will keep getting added in new each time you move said manuscript.