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