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Raiding with Leashes
Collect all of the battle pets listed below from classic raids.
Raiding with Leashes requires collecting battle pets dropped by bosses across four classic raids — Molten Core, Blackwing Lair, Temple of Ahn'Qiraj (AQ40), and Naxxramas — with the reward being the pet 
Mr. Bigglesworth upon completing the achievement.
Farm Molten Core Pets
Enter Molten Core and defeat Sulfuron Harbinger for the 
Mark of Flame (Harbinger of Flame pet), Magmadar for the 
Blazing Rune (Corefire Imp pet), and Golemagg the Incinerator for the 
Core of Hardened Ash (Ashstone Core pet). Molten Core bosses are straightforward burns at max level with no notable complications.
Farm Blackwing Lair Pets
Enter Blackwing Lair and defeat Razorgore the Untamed for the 
Unscathed Egg (Untamed Hatchling pet), Broodlord Lashlayer for the 
Blackwing Banner (Death Talon Whelpguard pet), and Chromaggus for the 
Whistle of Chromatic Bone (Chrominius pet). Note that the Razorgore encounter involves protecting eggs while controlling the boss, which can be tricky to solo — hunters can interrupt the mind control channel, drop a trap in the middle, re-control Razorgore, and walk him over the trap to cheese the fight.
Farm Temple of Ahn'Qiraj Pet
Enter the Temple of Ahn'Qiraj (AQ40) and defeat Viscidus to obtain the 
Viscidus Globule, which grants the Viscidus Globule battle pet.
Farm Naxxramas Pets
Enter the Wrath version of Naxxramas and defeat the relevant bosses for their pet drops; the Patchwerk encounter may require a tanky pet class rather than a caster-style pet, and the Gluth encounter is a straightforward burn, while the remaining bosses including Maexxna and Loatheb present no significant difficulty — if you are a caster, rely on instant-cast spells for any movement-required encounters.
Claim Mr. Bigglesworth Reward
Once all required pets have been collected and the achievement triggers, claim your Mr. Bigglesworth reward pet from the achievement panel.
Tips
All four raids reset weekly, allowing one attempt per lockout per character — running on multiple characters can increase your chances per week.
If your inventory is full when a pet drops, it will NOT be mailed to you by the Postmaster and will be permanently lost — free up bag space before each boss pull, and if needed, manually loot the pet from the ground rather than relying on automatic mailing.