This game is really stupid. On survival mode I used the same strategy the whole time and got like 30 kills per life. By 70 kills though, all of a sudden I was getting teamed on by 2 spears, a swordsman, and an archer, and it is impossible to get a hit in
What's the point of having both of those achievements? If you save the final human and replay the last scene you can get the second achievement in 5 seconds