Here is the full list of all 12 Running in the Y2K achievements.
Run a total distance of 10 Km
Run a total distance of 40 Km
What are you running of??
Kill 1000 animals
Kill 10000 animals
Kill 50000
Kill 3 animals with one spear
Jump on 3 animals consecutively without touching the ground
Fully upgrade all the elements on your cave
.-.. --- .-.. / ... --- / -... .- -..
-. .. -.-. . / .--. .-. --- --. .-. . ... ...
C'mon Jaytee you can do better than that...