My Lands: Black Gem Hunting

can anyone make a guide on most of the hidden quests; listing it out different quests and whats needed to activate them , trying to save as much as i can in order to get the helmet of divine wisdom

I can give you a hint,most quests are activated by the progress of your science,for example,if you are going to study heroes managing to level 2,the instant alchemy science completion quest will be activated.