Secret Stashes can be defined as hidden floating treasure chests that grant you free loot and achievement upon interacting with them. If you look under exploration achievement tab, you can check out whether this zone hides a stash. Loot level is always determined by the zone level, and you can obtain rewards once per character. Stashes are always located at the same place.
Celestion Secret Stash – Follow the White Jabbit (Exile)
Look for a cave near waterfalls in western Celestion. At the entrance use Harehollow Shrink Shroom, that will make you small, and you will be able to go through a gap in the cliff. Inside the cave, you will come across another mushroom Harehollow Growth Shroom, that will make your character huge, then double jump and grab your treasure chest. This Stash also grants you Follow the White Jabbit exploration achievement.
Algoroc Secret Stash – Deadstar Plunders (Exile)
Secret Stash is hidden on the top of the floating cage. In order to reach it you can use your pull abilities, or if you have any scientist around, ask him to interact with crystal under the cage, and all players in a close vicinity will get jumping buff, and easily reach the top of the cage. This Stash also grants you Deadstar Plunders exploration achievement.
Thayd Secret Stash – Treasure Finder Achievement (Exile)
In the Academy Corner behind a huge pipe.
Illium Secret Stash – Treasure Finder Achievement (Dominion)
Auroria Secret Stash – Glittery Goody Achievement (Dominion)
Galeras Secret Stash – Secret Surprise Achievement (Exile)
Close to the edge of a cliff (X:5387;Y:2377), between Tempest Refuge (to the west) and XAS Forward Camp (to the east).
Whitevale Secret Stash – Sunken Treasure Achievement
Enter the Fortune’s Fool located in the central part of the map, through the Hull door. Secret Stash is hidden on the second floor, behind another locked door. It’s guarded by Quartermaster Andal mob, and our suggestion is to bring a friend with you.
Farside Secret Stash – Treasure Detector Achievement
It is located in Derelict Silo 23, which you can reach by taking the teleporter at the end of the Ravenous Ravine.
Coords: 5809, -11483
Malgrave Secret Stash – Deadstar Plunders (Dominion) / Money Bags (Exile) Achievement
Just outside of Area 77 off the path, to the right and into the valley/gutter/ditch area below, on some thorns, directly to the east, going toward Scourwind Perch
Coords: 2086, 2913
Wilderrun Secret Stash – Stash Stealer Achievement
You need to climb up, in order to get it.
Coordinates: 1668, -2895