what are the secret quests?

Can somebody answer this question i would love to know what the secret quests are please

Win with only Dark, only Nature, only Metropolis. Beat each of the maps. Watch the credits in their entirety. Apparently there's some new ones, but I haven't discovered them yet. I believe it has to do with the black market.

Thanks romeo it seems u and one other person that actually puts stuff down

One of the new ones is buy something in the Black Market.