Quick answer: Complete Quick Hand’s Request in every region. Locate Quick Hand Zhang’s five treasure sets and deliver each to a Zhang hideout that accepts it. Lost and Found unlocks after the last delivery.
What Lost and Found asks for
Lost and Found is a Bronze achievement. Its description reads “Complete All [Quick Hand’s Requests]”.
Quick Hand’s Request is the tale Quick Hand Zhang gives Soul. Zhang has a client he won’t name who wants treasures and relics recovered from across the land, so he gives you a relic list for each region.
You need to track down sixteen relics across five treasure sets. The Crimson Forest, the Village of Lu, Meigu Lake and the Mirage Estate each hold three, and Pangzhen holds four. You can find the spot for every relic in the Quick Hand Zhang treasure locations.
Each region’s page lists two objectives. First you collect the treasures, then you deliver them. To deliver a set, pick its option in Zhang’s menu, where it sits between Trade and Leave.
Every region has a bell for Zhang’s Hideout, with the region’s name added to the label. Since some hideouts won’t accept certain sets, take each one to the correct location. The Quick Hand Zhang hideout guide names each hideout and explains how to reach it.
Every treasure set and the hideout that takes it
Pangzhen
Pangzhen’s four relics are the Ink Stick, the Carved-edge Inkstone, the Jade Brush Rest and the Tiger Paperweight. Find their locations in Lost Treasures of Pangzhen.
Turn this set in at Zhang’s Village of Lu hideout. His menu there shows “Lost relics in Pangzhen”, and handing it in earns you Goldblaze.
Village of Lu
The Village of Lu set has three relics: the Wedding Candles, the White Jade Twins and the Unveiled Statue.
Take it to Zhang’s Village of Lu hideout and pick “Lost Treasures in Village of Lu”. You get the Fine Thread accessory in return.
Crimson Forest
For the Crimson Forest set, track down the Ancient Crossbow, the Bloodstained Seal and the Sect Leader’s Snuff Bottle.
You don’t need to carry this set back to the Crimson Forest, because Zhang’s Village of Lu hideout accepts it as well. Choose “Lost Treasures of the Crimson Forest” to receive the Flying Dagger.
Meigu Lake
The Meigu Lake set is made up of the Blight Astrolabe, the Sundial of Impermanence and the Blue Blossom Compass.
Don’t bring this set to Zhang’s Village of Lu hideout; it has no option for it. Go to his Meigu Village hideout instead, then choose “Lost relics of Meigu Lake”. The hand-in rewards you with the Sha-Chi Blood Catalyst.
Mirage Estate
The Mirage Estate set has three relics: the General’s Bronze Mirror, the Gold-and-silver Sachet and the Golden Cloud-moon Hairpin.
Deliver it to Zhang’s Mirage Estate hideout, which sits deep inside a treasure cave. Choose “Lost relics of the Mirage Estate” there to receive the Thundermoon Lantern accessory.
When Lost and Found unlocks
Every hand-in crosses off that region’s delivery objective, and Zhang’s menu goes back to showing only Trade and Leave.
When you hand in the last of the five sets, Quick Hand’s Request is marked complete. The Lost and Found notice, “Complete All [Quick Hand’s Requests]”, appears right away while Soul is still at Zhang’s menu.
You can find every other Phantom Blade Zero achievement in the full achievements list.
