Guide by Lordacris on 11 Feb 2023 -
https://www.trueachievements.com/a382724/the-intrepid-explor...There are 5 Cairn Dungeons in total. 2 of which can be entered at any time, the other 3 can only be accessed via quests. Listed below all 5 Dungeons with their location or required quest:
Dale Family Tomb: Hogwarts Valley > Brocburrow. Head east from the Brocburrow Floo Flame.
Tomb of Treachery: Poidsear Coast > Tomb of Treachery. Under the bridge at the very North of Poidsear Coast.
The Collector’s Cave: Entered during the main story quest “The Helm of Urtkot.”
Feldcroft Catacomb: Entered during Sebastian Sallow’s relationship quest “In the Shadow of Time.”
Moonstone Garden: Entered during Poppy Sweeting’s relationship quest “The Centaur and the Stone.”
Note: Each dungeon needs to be entered to progress the achievement. Simply discovering the location isn't enough.