Collect all of the battle pets listed below from Bastion of Twilight, Blackwing Descent, Throne of the Four Winds, Firelands, and Dragon Soul.
Tinytron
Rattlejaw
Bound Stream
Drafty
Blazehound
Surger
Faceless Mindlasher
Unstable Tendril
Discarded Experiment
Twilight Clutch-Sister
Faceless Minion
Zephyrian Prince
Cinderweb Recluse
Infernal Pyreclaw
Corrupted Blood