Cooks Assistant
Items Egg, bucket of milk, pot of floor
Fishing Contest
Items 5-10 coins, Garlic , a regular fishing rod, a spade.
You need 10fishing
Goblin Diplomacy
Items 3 Brown Goblin mails, Blue dye, red dye, yellow dye and 35 gp.
Edit: I may be wrong about black - steel may be the highest. IF you get leather gloves from starting the quest, you'll make it to black. IF you don't get leather gloves for starting RFD then you'll get to steel. IF you don't make it to black, you would have to do Big Chompy which requires 30 range.