Kill 5 Circus Crawlers with a Bullpup in one wave.
Kill a Circus Scrake with a Crossbow.
Kill a Circus Husk with a LAW.
Kill 3 Circus Clots in a wave with the Lever Action Rifle.
Drop 5 different Tier 2 weapons in one wave.
Kill 10 Circus Clots with a Fire-based weapon.