ibo28,400 Locked 09 Feb 2024
Go into your room, the one which is located under the stairs to the smithy, and talk to your Palico housekeeper. Select "move to a new room" and this achievement will be yours.
There are 3 rooms you can have, with the first one being available from the very beginning.
You'll unlock the other 2 rooms after the 2 Zorah Magdaros quests respectively.