Best Stellar

When you craft [item=45854] you randomly get one of four books with the same name:

[item=45850] - red wolf
[item=45851] - white wolf
[item=45852] - grey wolf
[item=45853] - black wolf

You can buy them on the auction house or craft them yourself, to get the achievement use each of them (they have a 10 min shared cd).

These have a shared cooldown of 10 min. but the achievement is account wide so you can send one of the four books to four different characters and complete the achievement in about 3 min.

These can be bought on the Auction House and used by non-inscriptionists to get the achievement, but this is not recommended as:
a) They are upwards of 35k each.
b) The recipe is easy to obtain and craft.

This item is from Northrend Inscription, and you can get the pattern from ~10m of grinding mobs in Silverbrook in Grizzly Hills.

Materials per book can be bought on the Auction House for much cheaper than the books go for. (Psst, this might a good money making method if people actually do pay 35k!)

Eternal Shadow x3
Ink of the Sea x5
Light Parchment x10

The downside is that you get a random one of the four books every time you craft the recipe.

Once you have all four, use each one to transform into a wolf. There's a 10 minute shared cooldown between them.