GW2 Forgotten Stream achievement guide with detailed walkthrough. Forgotten Stream is a new achievement added with the Halloween patch and it is located in Cursed Shores.
Behind the Cathedral of Verdance is a is a river and there is a semi hidden path you can go through, The door at the end of the path is locked there are plenty of fast respawning risen along the way. Bring a friend if you don’t feel confident soloing all the risens. No chest here but you will get the Forgotten Stream achievement near the locked door.
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Wumzies
There is a small chest to the left of the door(when looking at the door).
Bali
Wumzies is right. It’s a small one and it’s even visible on your picture too (the one in front of the door – chest is on the left on the pic, just under the coral and the vet juggernaut).