I did get XP for solving the first quest. However I didn't notice any XP gain from solving the second quest... Both of them involved killing some monster at the bottom of a dungeon. I guess I will do another dungeon and see if I get any XP. I'm at level 20 and I was fighting level 10 mutants and level 12 spider boss. I was also fighting citadel mages and rangers but I forgot their level.