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Unlocking the Secrets
Complete the Zereth Mortis achievements listed below.
Unlocking the Secrets is a meta-achievement in Zereth Mortis that requires completing six zone achievements, rewarding the ability to fly in Zereth Mortis upon completion.
Explore All of Zereth Mortis
Uncover the entire Zereth Mortis map by traveling through the zone. This completes the Explore Zereth Mortis achievement automatically as you move through the area.
Collect Five Named Treasures
Complete Curious Collections by collecting any 5 of the 27 named treasures in Zereth Mortis. Named treasures include items such as 
Schematic: Viperid Menace, which requires pressing a nearby tablet to unlock its chest, and 
Percussive Maintenance Instrument, found by climbing a pillar. One treasure at the northern edge of the zone requires Door of Shadows, a flying mount, or the Frog'it world quest to access.
Collect Firim in Exile Parts
Complete Tales of the Exile by collecting 
Firim in Exile, Parts 1 through 7, which are scattered across Zereth Mortis and can be found naturally while exploring the zone.
Kill Ten Unique Rares
Complete Adventurer of Zereth Mortis by defeating 10 unique rare enemies in Zereth Mortis, which can be done while questing or exploring the zone.
Complete Treasures of Zereth Mortis
Complete the Treasures of Zereth Mortis achievement by collecting the required treasures throughout the zone, many of which overlap with those counted for Curious Collections.
Complete Completing the Code
Complete the Completing the Code achievement in Zereth Mortis to finish the final requirement for Unlocking the Secrets and earn Zereth Mortis flying.
Tips
The entire meta-achievement can be completed in approximately 6 hours after unlocking Zereth Mortis.
If flying does not activate after completing the achievement, zone out to Oribos and return to Zereth Mortis to resolve the issue.