Here is the full list of all 47 Fossil Hunters achievements.
Collect all other achievements
Pick up the Sammy rock and bring it to the elevator
Collect all Abyss journal entries
Collect all journal entries
Collect all golden idols
Complete all the Collector's requests
Finish the game
Make 100 skeletons
Pick up an idol from the treasure hoard
Unlock all schematic doors
Build 5 colossal skeletons
Submit 50 clean & pristine skeletons
Use 20 supports
Die in a pit 100 times
Use 20 bridges
Make 50 skeletons
Collect all Magma Chamber journal entries
Unlock the dynamite shopkeep
Build 10 huge skeletons
Unlock the bridge shopkeep
Have your multiplayer friends drop out
Get all destruction achievements
Have a fossil smashed by a lavamander
Have all three power-ups active at once
Collect all Mushroom Caverns journal entries
Build 15 big skeletons
Use 20 lamps
Submit a skeleton with every piece damaged
Drop 50 fossils in pits
Prevent a death with a dodge roll
Unlock the support shopkeep
Use 20 dynamite barrels
Play as each of the Fossil Hunters
Collect all Digsite journal entries
Have a fossil covered in moss
Rearrange the furniture in the lab
Drop a golden idol in a pit
Transport 12 or more items with the elevator
Unlock the lamp shopkeep
Collect a golden idol
Have a fossil eaten by a crawler
Make 10 skeletons
Unlock a schematic door
Have a fossil smashed by a cave-in
Leap the maximum distance
Make a skeleton
Bring 20 new objects into the lab