Here is the full list of all 20 There Was A Caveman achievements.
Die 500 times!
Die 250 times.
Have 100 skulls.
Complete the guts
Complete guts without dying!
You found your love!
Die 100 times.
Complete the snow plains
Complete snow plains without dying.
Complete afterlife without dying.
Complete underwater without dying.
Slay 100 turtles.
Complete forest without dying.
Complete caves without dying.
Complete the afterlife
Complete the underwater area
Complete the forest
Die 10 times.
Complete the caves
I quickly forget..