Fledgling Hero of Warcraft

Fledgling Hero of Warcraft is a cross-game achievement that gives World of Warcraft players who hit level 20 on or after March 11, 2016 a hero, Lady Liadrin (a paladin), in Hearthstone: Heroes of Warcraft.

Notes[]

Presumably, a player would have to use the same Battle.net account to log in to both World of Warcraft and Hearthstone: Heroes of Warcraft.
The free-to-play version of World of Warcraft called World of Warcraft: Starter Edition allows players to level a character to level 20, so this achievement can be gained at no cost.
The achievement is not retroactive, you must hit level 20 on or after March 11, 2016.^[1]
Appears to be bugged in multiple ways on US realms,^[2]^[3] but is okay on EU realms.

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^ Aerythlea 2016-03-15. Become a Hero in Azeroth and Earn a Hero in Hearthstone!. World of Warcraft official game site (EU). @Altmax: No, it's not retroactive so you'll need to get another character to level 20. :)
^ Nethaera 2016-03-15. Become a Hero in Azeroth and Earn a Hero in Hearthstone!. World of Warcraft official game site (US). @Gerrey: https://us.battle.net/support/en/article/breaking/20062991
^ Vrakthris 2016-03-15. Hearthstone Promotion Achievement issue. Official Customer Support forum.

Wowhead News Lady Liadrin Paladin Hero: Free Reward for Level 20+ World of Warcraft Players by perculia 2016/03/14 4:35 PM

WoW Official Game Site (US) Become a Hero in Azeroth and Earn a Hero in Hearthstone! Blizzard Entertainment 3/14/2016

WoW Official Game Site (EU) Become a Hero in Azeroth and Earn a Hero in Hearthstone! Blizzard Entertainment 14/03/2016

	Fledgling Hero of Warcraft	10
	Raise your character's level to 20.
Reward: Cross-Game Reward: Lady Liadrin Paladin Hero in Hearthstone