Ferret the Hunters is an achievement in the Elder Scrolls Online. It can be completed in the Galen zone. The Firesong DLC is required to complete this achievement.
Location of all the hunters in Galen
Below you can find a map with all the locations of the hunters marked.
Where to find Urredhel in Galen
Urredhel can be found north of the Glimmertarn Wayshire. There is a river that flows into the ocean. You can find Urredhel on the west side, where the river meets the ocean.
Where to find Elissa on Galen
Elissa can be found north-east of Suncleft Grotto, on the eastern side of the lava river. Just make your way to the eastern side of the lava river, then walk south until you see parts of a ruin. Elissa will be at the most southern point of these ruins.
Where to find Sabashur on Galen
Sabashur can be found south-west of the Windwrack Fort. Simply walk west along the cliffs (at the top, not at the beach) from Windwrack Fort, and you will find Sabashur near some big sunflowers.