Don't Let the Tala-door Hit You on the Way Out

I was able to obtain the level 2 plans after completing the following quest chain for the Arsenal building plans. I was awarded Comprehensive Outpost Construction Plans, but the Establishing Your Outpost achievement did not pop. So there appears to be a hotfix. Once you have these plans, return to your garrison and Gazlowe will have a quest available for you.

Start at your garrison to pick up:
1. At Your Command

If you choose an Arsenal building then follow this chain:
2. The Quarry Quandary
3. Unleased Steel

Pick up these three quests from Morketh Bladehowl <Master Armourer>:
4. Out of Jovite
5. Gas Guzzlers
6. Iridium Recovery

Return to your outpost to turn these quests in and Morketh will send you on:
7. Going to the Gordunni
Find him and he gives you:
8. Dropping Bombs
In which you run up the hill and take the grappling hook over the wall.

Then take these three quests in the Gordal Fortress and a grunt will follow you around so you can return them as you complete them:
9. Supply Recovery
10. Punching Through
11.Prized Repossessions

once you have completed all three quests, the grunt gives you:
12. The Lord of the Gordunni

Kill Lord Morkurk and return the quest to the grunt. He will port you back to your outpost. Return this quest to Morketh:
13. The Only Way to Travel
This is the quest you need for the Comprehensive Outpost Construction Plans which will give you Level 2 plans at your garrison BEFORE lvl 96.

Side note:
Morketh will offer you one more quest:
14. Armor up
which gives you Morketh as a follower.

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For the Arcane Sanctum, follow this quest chain:

2. An Audience With the Archmage

Archmage Khadgar will give you:
3. Making Acquaintances

Then pick up these three from Magister Krelas:
4. Creating the Ink
5. Forming the Scroll
6. Gathering the Spark

Once you've returned all three quests, you will be offered:
7. Next Steps
which is returned at your outpost.

Magister Krelas will give you:
8. The Foot of the Fortress

Meet up with him and he will give you:
9. Dropping In

Take the portal at the top of the hill over the wall and Magister Krelas will give you these three quests and a magus that will follow you around so you can return them as you complete them:
10. Vicious Viziers
11. Orbs of Power
12. While We're in the Neighborhood

Return your quests to your companion and once all three are completed, you will be offered:
13. The Final Step

Kill Lord Morkurk and return it to the mage standing there. He will port you back to your outpost to turn in:
14. Due Cause to Celebrate
This will give you the Comprehensive Outpost Construction Plans. Return to your garrison and Garlowe will give you a quest to Warspear and access to those level 2 plans.

Good luck!

For the Plight of the Arakkoa part of this, you need to start with Burning Sky. The breadcrumb quest is from your Outpost in Talador - As the Smoke Rises for Horde and They Came From Above for Alliance.

For the In the Shadows of Auchindoun part, start with Powering the Defenses (Powering the Defenses for Alliance). For Horde, this is in the area you are lead to when doing The Lady of Light, which again becomes available after you have followed Durotan around and have done the first two parts of this achievement.

So, in conclusion, if you are looking for where to go after having done The Battle for Shattrath, pick up As the Smoke Rises and The Lady of Light (or the equivalent for Alliance) in your Outpost.

I've lost the questline to Establishing your Outpost, can anyone point me in the right path please?

Gone thru all fp's but not found the quest giver.