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