Here is the full list of all 23 Lost Artifacts - there are Ancient Tribe Survival achievements.
For the First Totem
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 inflating the boat
For completing 15 levels with 3 stars
For completing all levels with 3 stars
For restoring the signal fires
For the Second Totem
For the Third Totem
For the Fourth Totem
For the Fifth Totem
For the Sixth Totem
For the Seventh Totem
For restoring Stonehenge
For defeating the Evil Savage
For speeding up construction
For stopping time
For activating an altar