Get to all the palces marked on the map a bit lower, those are the places you'll need to visit for The [Explore Icecrown] Achievement! The Achievement is needed for the [Explorer Northrend] Achievement, wich is needed for the [{Name} the Explorer] title! Hope this helps ^^

Icecrown:
1.  The Bombardment
2.  Onslaught Harbor
3.  The Fleshwerks
4.  Sindragosa's Fall
5.  Valley of Echoes
6.  The Conflagration
7.  Jotunheim
8.  The Shadow Vault
9.  Icecrown Citadel
10. The Broken Front
11. Aldur'thar: The Desolation Gate
12. Valhalas
13. Ymirheim
14. Corp'rethar: The Horror Gate
15. Scourgeholme