Full list of all 12 Lost Artifacts achievements worth 1,000 gamerscore. It takes around 6-8 hours to unlock all of the achievements on Xbox One.
For restoring a farm
For constructing a building
For defeating the Evil Savage
For restoring Stonehenge
For restoring the signal fires
For activating an altar
For speeding up archaeologists
For speeding up construction
For completing all levels with 3 stars
For defeating the Dark Priest
For inflating the boat
For stopping time