Gigapocalypse (EP)

You need to zap/shoot the duck/chick 10 times, across separate runs. He can be found on the beginning (usually the first 60 seconds) of Knight Age 1 world. He will appear in the what looks like a cracked shell and when you shoot him, he starts running, keep zapping him. I shot him a bunch of times until he disappeared. Once he disappears, hit cn_start, select upgrade to take you back to the menu, and do another run. His appearance is RNG-dependent, so if he doesn’t show up in the first 60 seconds, quit out and start another run. Took me about 10 minutes to unlock after about 15 or so tries.