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| {{achievementlong|Twilight Duo (10 player)}} || With at least two [[Twilight dragonflight|Twilight drake]]s still alive, engage and defeat {{npc||Sartharion|the Onyx Guardian}} in [[The Obsidian Sanctum]] in [[10-player mode]]. || {{cost|ach=10}}

| {{achievementlong|Twilight Duo (10 player)}} || With at least two [[Twilight dragonflight|Twilight drake]]s still alive, engage and defeat {{npc||Sartharion|the Onyx Guardian}} in [[The Obsidian Sanctum]] in [[10-player mode]]. || {{cost|ach=10}}

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| {{achievementlong|Onyxia's Lair (10 player)}} || Defeat {{npc||Onyxia}} in [[10-player mode]]. || {{cost|ach=10}}

| {{achievementlong|Onyxia's Lair (10 player)}} || Defeat {{npc||Onyxia}} in [[10-player mode]]. || {{cost|ach=10}}

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| {{achievementlong|She Deep Breaths More (10 player)}} || Defeat {{npc||Onyxia}} without anyone taking damage from a Deep Breath in [[10-player mode]]. || {{cost|ach=10}}

| {{achievementlong|She Deep Breaths More (10 player)}} || Defeat {{npc||Onyxia}} without anyone taking damage from a Deep Breath in [[10-player mode]]. || {{cost|ach=10}}

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