GW2 Lost and Found achievement can be completed by returning different items.
Important Note: You can return specific item only once.
Tier 1 – 1 item returned
Tier 2 – 3 items returned
Tier 3 – 6 items returned
Diessa Plateau – Refugee’s Wooden Soldier Item
You will get Refugee’s Wooden Soldier by collecting a Dirt-Covered Object. (there are many locations around Village of Butcher’s Block where you can find this object).
Return the item to Refugee Malia in Lion’s Arch.
Wayfarer Foothills – Refugee’s Goblet
You will get Refugee’s Goblet by collecting a Snow-Covered Object.
Return the item to Refugee Kirk in Lion’s Arch.