WoW Achievements — Browse All Achievements
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Browse achievements from all expansions including The War Within, Midnight, Dragonflight, Shadowlands, and Classic. Find guides for Glory of the Raider, meta-achievements, PvP achievements, exploration, and more. Track your achievement points and completion progress via Battle.net.
Celestial Challenge
Complete the trials of all four Celestials, besting them each in combat on the Timeless Isle.
Celestial Challenge requires defeating all four Celestials on the Timeless Isle, which can be completed at any character level by joining a raid where at least one player has the associated quest.
Reach the Timeless Isle
Travel to the Timeless Isle by getting a ride on a two or three-seated flying mount with another player, as crossing the sea from the Jade Forest without one will drain your fatigue meter. Once there, pick up the flight path for 
1 gold 10 silver from the nearest flight path node.
Join a Celestial Raid
You do not need the quest yourself to earn credit — you only need to be in a raid group where at least one member has the quest active when a Celestial is killed.
Defeat All Four Celestials
Kill all four Celestials on the Timeless Isle to complete the achievement, as each one must be defeated to register full credit toward Celestial Challenge.