Originally Posted by Will
There is actually a weird bug with that episode in terms of the order you beat it in. The way that 100% works on getting the achievement: tell the Poppers "worship me." Brady tells them to worship him. Then tell the Poppers to "attack me."
You should still have an autosave right in there, so hopefully you won't have to replay much. Sorry for the problem!
I originally told the Soda Poppers to "attack yourselves." Just struck me as funnier. Thanks!