As I have progressed through Archaeology and climbing the ranks, I have discovered some mysteries are not currently obtainable. This post is to serve as a living document of which mysteries are currently obtainable and which are not. For those mysteries that are not currently obtainable, a reason will be provide. This post is NOT a guide to what each mystery is nor how to solve it. For that, please see this RS Wiki Page.
Key:
Obtainable mysteries will be colored as green.
Unobtainable mysteries will be colored as red.
Not implemented mysteries will be colored as yellow. (Not implemented means does not show up on the list when you "read" your Archaeology journal.
Any mystery that is not colored has not been confirmed to work or not by me or another user
Mysteries:
Breaking the Seal
Prison Break
Eyes in Their Stars
Contract Claws - requires Bacon which is unobtainable.
Embrace the Chaos
Secrets of the Monolith - There is no cut scene after you are promoted to Assistant
Fallen Angels
Queen of the Icyene
Time Served
Fall and Rise
Dagon Bye - Contract Claws is a requirement for this mystery
Atonement
Leap of Faith
The Dour of Bable
The Cult of Orcus
The Spy Who Loved Metal
Wing Out
The First Commander
Into the Forge
Out of the Crucible
A Study in Aether
Forge War!
Crypt o' Zoology
Teleport Node On
Know Thy Measure
The Epic of Hebe - When trying to restore the Statue of Hebe, you receive a "You can't reach that." message in chat.
Howl's Floating Workshop - Requires Research, which is not implemented
Writings on the Wall - Requires Research, which is not implemented
You Have Chosen... - Requires Research, which is not implemented
Death Watch
The Everlight - When trying to restore the Statue of Padosan, you receive a "You can't reach that." message in chat.
Hallowed Be...
Free Your Mind
Decimation
The Forgotten Prisoner
Shadow Fall
The Vault of Shadows
Fragmented Memories
Heart of the Forge
I Am Become Death
Mysterious City
Note: I haven't tried every mystery yet, so if you know of any that are obtainable or not, please comment on this post and I will update! Thanks!