Mush Appreciated

The fastest way to get this achievement is to level up your Transport Network to level 3 ASAP. Each level of the network gives you an additional daily quest for a total possible for 1500 a day. It'll take a few weeks to knock this out from scratch, but the quests are super easy and fast.

You can complete this achievement by becoming exalted with Murasmius

How do you Unlock Murasmius Reputation:

1. 
   
2. Research and Unlock Transportation Network from Zayhad the Builder the Hearth of the Forest
3. 
   
4. Accept and complete "Quest Silence in the Stalks"
5. 
   
6. Continue the storyline
7. 
   
   
8. In the cave under The Stalks you will find Murasmius and his quarter master
9. 
   
10. Do dailies and quests to raise reputation ( no info for the moment - probably from him )
11. 
    

You need 6000 reputation to surpass friendly. Each daily gives you 385 reputation
Intro video guide

I see there is mush more to learn.