Here is the full list of all 29 BCE achievements.
Get clubbed off a cliff
Play on every map
Win a game
Burn an offering in your cave
Get 100 kills with spears
Get 100 kills with your fists
Get 100 kills with clubs
Light 50 fires
Extinguish 50 fires
Take a ride off the waterfall
Obtain a blessed weapon
Get killed by the shark
Get stunned by a rock you threw
Light 10 fires with a thrown spear
Extinguish 10 fires with a thrown spear
53,594
Reflect a rock and stun somebody with it
Win a flawless victory
Get a double kill with a club
Get a double kill with a spear
Get 10 Kills in a single game
Club someone who is stunned by a deflected rock
Get crushed by a falling rock
Come back and win a game from a 0-2 lead
Extinguish at least 1 fire per round, then win the game
Win 7 matches in a row
Lose 7 matches in a row
Look at the credits
Get a kill with a rock