"Kill the Rieklings" is an objective in the side quest "Retaking Thirsk" in Elder Scrolls V: Skyrim - Dragonborn.
Walkthrough
On your approach to Thirsk Mead Hall you will be under attack by a number of Rieklings. They will all be attacking you as soon as they can. There are close to 20 Rieklings. You will find the normal ones as well as Riekling Warriors, Hunter.
Once the ones outside are dead then you need to head inside Thirsk Mead Hall.
