Primary
1. Destroy all structures in the outer city ; includes 4 archery ranges
2. Destroy the castle's Citadel ; in the center of the top of the map
3. Destroy the Earth Hammer ; in the North-East corner

Bonus
1. Use Untaimed Allegiance on both spider lairs ; to the left and right of your base
2. Capture the Inn ; left side of Fornost outer city
3. Capture the Signal Fire ; in the North-West corner