1. Party Time for Plants!
Get 500 vanquishes with the primary weapon of any Party Plant variant
Party Plant vanquishes count if you vanquish Zombies as either Party Citron, Party Rose, or Party Corn
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2. Party Time for Zombies!
Get 500 vanquishes with the primary weapon of any Party Zombie variant
Party Zombie vanquishes count if you vanquish Plants as either the Party Imp, Party Brainz, or Captain Partyman