Sure, it's just a video game, but also, you killed someone.
Burn 250 catapults total.
Max out all of the upgrades.
Burn 2,500 puny humans total.
Burn 1,000 puny humans in one run.
Burn 100 ballistas in one run.
Burn 50 catapults in one run.
Earn 10K gold.
Burn 500 puny humans in one run.