With the Wrath of the Lich king cycle for World of Warcraft almost complete, it is time for everyone to finish up all of their achievement goals.  For many players that means finishing collecting all of the Heroic mode achievements.  This guide walks you through getting all of the achievements in the two 5-player heroic instances located in Ulduar. Those instances are the Halls of Stone and the Halls of Lightning.  Each consists of four bosses that must be defeated to earn the instance achievement and several boss specific achievements.

Abuse the Ooze - This achievement confuses many players and is generally the hardest in the instance to complete.  This is because the Iron Sludges are not spawned as one of the adds, instead the oozes that are spawned while Sjonnir is between 50% and 25% turn into Iron Sludges upon touching Sjonnir.  This means that you need to burst him down to 50% and then stop all DPS on him while you wait for oozes to spawn.  Once they do, allow them to reach him and become Iron Sludges, and then dispatch them.  Once you have killed five of them return all DPS to Sjonnir to kill him and get your achievement.

Join Byron “Messiah” Mudry as he walks you through getting the eight achievements located in these two instances:Halls of Stone and Halls of Lightning.