Outland Dungeonmaster

If you're at level 80 and are thinking about doing this achievement for fun - do all of the instances on Heroic mode. You will get credit for both the Heroic and Normal versions of the dungeon and fulfill the requirements for Outland Dungeon Hero at the same time.

Happy Hunting!

That's an ignorant comment. In the first place, keys for most heroic BC instances don't necessarily open doors, but function more as an atunement marker. It doesn't matter if your blacksmithing is 450 and you have titanium skeleton keys, or if you're a rogue with 400 lockpicking, if you haven't earned the rep and purchased the corresponding key, you simply aren't going to get in. For instance, the Warpforged Key unlocks heroic difficulty for Tempest Keep dungeons. In all cases but one (The Arcatraz), there's no actual door or gate to be unlocked, and no other kind of key will permit entry. Yo

As of Cataclysm you are no longer required to be attuned or have keys just set to Heroic and head on in.