WoW Achievements — Browse All Achievements
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Observed (10 player)
Defeat Algalon the Observer in 10-player mode.
Observed (10 player) requires defeating Algalon the Observer in 10-player mode in Ulduar, unlocking access through a chain of hard mode completions across multiple bosses, and rewards the title Starcaller.
Complete Iron Council Hard Mode
Defeat the Iron Council with Runemaster Molgeim last (medium mode) or Steelbreaker last (hard mode). This allows one player to loot an Archivum Data Disc.
Collect Four Hard Mode Sigils
Using the Archivum Data Disc, the player who looted it can obtain sigils from Hodir, Thorim, Freya, and Mimiron by defeating each of them on their respective hard modes.
Complete the Algalon Quest
Turn in the four sigils to complete the Algalon quest, which rewards the Celestial Planetarium Key.
Kill Yogg-Saron First
Defeat Yogg-Saron before attempting to use the Celestial Planetarium Key, as the key can only be used to unlock the Planetarium after Yogg-Saron has been killed.
Enter and Defeat Algalon
Use the Celestial Planetarium Key to unlock the Planetarium, then engage and defeat Algalon the Observer. Algalon has no normal mode, so engaging him immediately activates the encounter.