You will get this achievement naturally but if you want to get it easily and fast here is the way.
When you get to Riverwood find an elven character named Faendal and converse with him, he will give you a fake letter to give to Camilla Valerius. Do it and he will be available as a follower.
Now ask him to follow you then ask for Archery training then pay him, go up as much levels as you can afford and then ask to trade equipment and take your money back. Rinse and Repeat until you are level 10.
If you need money pick up the Lumbermans Axe stuck in a log behind the mill. Near the mill there is an intractable pile of logs that you can chop to make Fire Wood. You can sell these to Hod for 5 gold coins per Fire Wood.
If you vote negative please leave a coment on how I can improve this guide.