Here is the full list of all 23 Lost Artifacts - there are Ancient Tribe Survival achievements.
For the Second Totem
For restoring the signal fires
For restoring Stonehenge
For completing 15 levels with 3 stars
For inflating the boat
For activating an altar
For speeding up construction
For the First Totem
For defeating the Evil Savage
For speeding up archaeologists
For completing 5 levels with 3 stars
For restoring a plant
For constructing a building
For clearing one roadblock
For collecting all trophies
For defeating the Dark Priest
For completing all levels with 3 stars
For the Third Totem
For the Fourth Totem
For the Fifth Totem
For the Sixth Totem
For the Seventh Totem
For stopping time