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Raiding with Leashes IV: Wrath of the Lick King
Collect all of the battle pets listed below from Ulduar, Trial of the Crusader, and Icecrown Citadel.
Raiding with Leashes IV: Wrath of the Lick King is a 10-point collection achievement requiring you to obtain battle pets dropped by bosses in Ulduar, Trial of the Crusader, and Icecrown Citadel, rewarding the 
Celestial Invitation upon completion.
Farm Pets in Ulduar
Enter Ulduar (the Timewalking version also works) and defeat bosses to collect their associated battle pets. The 
Red-Hot Coal drops from Magma Rageling I, and additional pets drop from other bosses throughout the raid.
Farm Pets in Trial of the Crusader
Enter Trial of the Crusader and defeat the bosses to collect the battle pets that drop there.
Farm Pets in Icecrown Citadel
Enter Icecrown Citadel and defeat bosses to collect their pets, including 
Drudge Remains and 
Call of the Frozen Blade from The Lich King — Drudge Remains appears to drop on Normal mode and Call of the Frozen Blade on Heroic mode, so run both difficulties when farming The Lich King.
Roll for Pet Drops
These pets are not on personal loot, so if you run these raids with other players, you will need to roll against them when a pet drops.
Tips
Both 10-player and 25-player versions of each raid can drop these pets, and running Heroic difficulty does not appear to increase drop rates, so choose whichever lockout is fastest for you.
See the video guide for a full walkthrough of each raid and boss location.