There´s this girl in... well, who knows... around Falkreath?, (Spoilers ahead, kind of) she says she escaped Helgen and now lives alone in the mountains, she practices archery and you can practice with her.
Real problem: she has three (four) objectives to point to buuut... the one she wants you to fire at is so far that even with zoom you can see it! Is it a bug, or my archery is not that good yet or you have to shoot without see?? Help .-.
You have to keep trying. Also, it really REALLY helps if your archery skill includes the perk that gives you 30% faster draw time. Some say the zoom perk (eagle-eye I think?) is vital, but I completed this challenge after getting that fast draw perk.