I had a few ideas for pet battle achievements I thought I'd share:
1.Get X number of victories only using X type pets, Should reward a new rare pet of that type.
2.Defeat Master trainer X.
3.Win X (10-200) number of random battles, 200 random battle wins rewards you with a new epic pet of your choice. I would love to be able to go to a certain NPC in dalaran when i get the achievement and get to pick from 3 brand new boss pets like Lil' Illidan, Lil' kil'jaeden and Lil Hogger for example
What pet battle achievements do you want to see?