There are 6 Quests and 3 Missions for the 26th Anniversary. It also has a Bonus Loot Achievement.

They are done in 2 chains as follows:
26th Anniversary Chain: Something Unexpected - The Doke Trio - The Secret Sponsor
26th Anniversary Chain: Diary of the Jade - The Discovery - Diary of the Jade - The Search - Back to Square One - On the Jade Thief's Trail - Diary of the Jade - The Tests | The Great Jade Idol Caper


Diary of the Jade - The Discovery
Diary of the Jade - The Search
Back to Square One
On the Jade Thief's Trail
Something Unexpected
The Doke Trio


Diary of the Jade - The Tests
The Great Jade Idol Caper
The Secret Sponsor