If you are looking to get the Faded Wizard Hat for your Toy Box come 6.0 then you are in for more than you probably thought. It takes a 24 quest long chain plus 2 other quests to get the quest to obtain this item. But it took me less than an hour to complete all 24 + 2 other quests and finally Farewell, Minnow so don't fret. This is a Horde only quest chain.
1.)Azshara Blues
2.)Friends Come In All Colors
Helping out Ergll:
3.)A Little Pick-me-up
4.)Absorbent
---5.)Full of Hot Water
6.)That's Just Rude!
Finding Archmage Xylem:
7.)The Way to a Mage's Heart
8.)Wash Out
9.)Dressed to Impress
Helping Xylem and his Apprentices:
10.)Shear Will
11.)Waste of Thyme
12.)Renewable Resource
13.)Manual Labor
14.)Trouble Under Foot
Getting to Xylem's Trials
15.)The Pinnacle of Learning
16.)Watch Your Step
Xylem's Trials
17.)The Trial of Fire
---Achievement: Glutton for Fiery Punishment
18.)The Trial of Frost
---Achievement: Glutton for Icy Punishment
19.)The Trial of Shadow
---Achievement: Glutton for Shadowy Punishment
Finding Azuregos
20.)Xylem's Asylum
21.)Wasn't It Obvious?
22.)Easy is Boring
23.)Turning the Tables
The Final Battle
24.)Fade to Black
When you turn in Fade to Black there is 2 quests you can see in your mini map. Complete them and then see Azuregos for Farewell, Minnow. The 2 quests are Ice Cold and Pro-liberation.
Shout-out to Ch3wy for getting together all the original info. I added a bit of information that was necessary to avoid confusion in finding 2 quests that must also be done to get this achieve that were not listed in the original post. My apologies for not having links like the original post, I am unaware of how to do so.