You need 5 influence points with the Stone-Bear Hold Avvar to earn this achievement. You earn these points through various sidequests and operations.
Quests - 1 Influence Point Each
- Hakkon's Trials
- A Father's Name (Must give offering to huntmaster)
- In Exile
- Up And Away
- Ameridan's End (Story Related, comes after the cutscene).
- It Remains To Be Seen
Note for "Up And Away" - If you do ask her to include you in her prayers, and you stay and watch, you get +1 to a relevant stat. Not relevant for the achievement but nice to know.
Hakkon's Trials and
A Father's Name are started in the Avvar Hold.
Up And Away is started at the dock where you ask for a boat for the 'story'.
In Exile is started just to the South of Ridgeline Camp (West side of map).
It Remains To Be Seen is started by finding one of the 5 hanging skulls in the swamp where they're holding Storvacker. The others are then revealed on the map.
There are also 2 War Table Operations you can do to gain 1 influence each. The rewards are the same no matter which advisor you complete them with.
Send Relics of Tyrdda Bright-Axe
This requires that you have already completed the operation
Locate Weapon of Tyrdda Bright-Axe, which in turn requires that you've found the landmarks noted here
http://dragonage.wikia.com/wiki/Landmarks_in_the_HinterlandsSend Skywatcher to Stone-Bear Hold (Glitched on 360? No influence point)
Skywatcher is the friendly Avvar you find in the Fallow Mire. You can recruit him after you kill the Avvar chief in the area. I'm fairly certain if you don't let him join you, he'll just stand there until you come back, but as there's the other operation he's not necessary.
Note from TheIcemanCometh - Influence points from operations may disappear(?).
Once you have 5 influence, and have finished the 'story' of the DLC, head back to the chief. Once you turn the quest in the achievement unlocks.
As many people have added info now, I'd just like to give a general thanks to the comments.
If there's anything else you feel isn't right or need additional help feel free to comment.
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