Obtain Invincible from Arthas in Icecrown Citadel.

Obtain The Horseman's Reins from The Headless Horseman in the Scarlet Monastery during Hallow's End.

Owner of Amani War Bear.

Obtain a Grand Black War Mammoth.

Obtain the Brutal Nether Drake from Arena Season 4 of The Burning Crusade.

Obtain the Deadly Gladiator's Frostwyrm from Arena Season 5 of Wrath of the Lich King.

Obtain Mimiron's Head from 25-player Yogg-Saron with no Keepers assisting you.

Defeat Yogg-Saron in Ulduar on 10 or 25-Player Pre-Nerf difficulty, before the release of the next raid tier.

Completed the paladin quest to obtain a Charger.