Win a Long Game on Abusement Park on Normal Difficulty.
Kill the "Ring Leader"(Circus Patriarch)
Kill 2 Circus Stalkers with a Melee weapon to the back in one wave.
Land the killing blow on a Circus Fleshpound with a Pistol.
Drop 5 different Tier 2 weapons in one wave.
Unlock 10 of the 13 Circus Achievements along with any Abusement Park achievement.