Never A Day's Rest

When you first approach Nomi you don't seem to be able to interact with him, you got to have the mats in your bags for the option to place work orders to pop up on him.

Make sure to have either Lean shank, Mossgill Perch, Stormray or Wildfowl eggs in your bags before attempting to place a work order.

I've been stuck at 96/100 for a good week and I keep giving work orders to Nomi. Bugged?

Edit: Once I started giving him ingredients other than Silver Mackerel, the counter advanced again. Now at 99/100.

It seems that once you learn a Rank 3 recipe for that particular ingredient (Silver Mackerel in my case), it will no longer advance this achievement. Don't waste your mats like I did!

Talk to [npc=101846] in Dalaran to earn this achievement. With any luck you'll learn some new cooking recipes. Most likely you'll literally burn through a lot of mats.