There are 4 total Shelters in Svartalfheim. When you get near one, you have to follow the yellow-painted dwarf signs to get to the entrance to each one. You must actually make it to the inside of the Shelter, where the dwarves actually are, to get credit for it. Simply finding the entrance doesn't count.
- Gullnamar has
Jordber Shelter in the northeast, west of Ancient Halls and
Grenhellir Shelter in the middle, west of Uldar
- Svaladal has
Jordeygr Shelter in the south, east of Yrkland Mylna
- Vangrinn has
Hodda Shelter in the west, north of Alethorp
This video shows Grenhellir, Jordeygr, and Hodda. Jordber is basically handed to you when you start free roam.
credit for video: GosuNoob on YouTube*** Spoiler - click to reveal ***This achievement title HAS to be a reference to the South Park movie from 1999. After the kids see the Terence & Philip movie Asses of Fire, they start cussing in school, which gets them in trouble. They are then in Mr Mackey's office where he asks them where they heard such language. They say Mr Garrison, to which Mr Mackey replies, "I seriously doubt Mr Garrison ever said 'eat penguin shit, you ass-spelunker.'" - video contains obscene language