The Mana Tunnel Master journal achievement ("Use all Mana Tunnels") requires registering every mana tunnel in Iria, all 83 of them, and it is one of the requirements for the Phantasmal Sight technique alongside Homestead level 5, the Archaeologist title, and the Fortune Cookie entry in the Cooking Diary. The 30-tunnel lists that circulate online describe the tunnels that existed in 2013 and are no longer enough.
The free Mana Tunnels checker reads a screenshot of your in-game teleport window (click any mana tunnel to open it; registered tunnels show blue, missing ones gray) and sorts this whole list into registered and still needed, right in your browser.
To collect the ones you are missing: search the exact tunnel name below in the Traveler's Guide, teleport to it, and click the tunnel when you arrive to register it before moving on. Teleports are free while your cumulative level is under 10,000 or with Basic VIP, even to tunnels you have not registered yet.
Names are exactly as the Traveler's Guide lists them. Where the map hover tooltip reads differently, the note says so. The Guide also lists two outgoing-only Collapsed tunnels at Lappa and Erkey Falls; they never appear on the map and are not part of the achievement tracker.
Zardine (13 tunnels)
Renes
Pera Volcano — The upper right icon of the tight pair at the peak.
Pera Volcano - Flint Region — The lower left icon of the tight pair at the peak.