Thanks to Basaro for the info.
This quest released at the same time as Elder electric.
 Collect from Monsters 20 times.
Rewards : 200 XP and 300 Food
 Have a level 10 Lightning (ELECTRIC) Hybrid and a Level 10 Plant Hybrid, then breed them to hatch an egg! (Fire works but you may need to breed those monsters first on breeding den, you don;t need to wait it until finish the breeding process though)
Rewards : 250 XP and 250 Food
 Have 10 Electric Hybrids, then hatch an egg. (Hatch Fire)
Rewards : 200 XP and 200 Food
 Harvest 15 Crops!
Rewards : 50 XP and 250 Food
 Hatch a Mythic Electric Hybrid! (autocompleted for me)
Rewards : 600 XP and 900 Coins
 Place two Granite Conductors and a Cloud Peak on the mountain. (in Decorations near the end)
Rewards: 550 XP and 250 Food
NOTE: Elder Electric appears in the shop at this point for 1500 Diamonds. Breed time says 13.5 Hours!
 Hatch the Elder Electric Monster!
Rewards: 2000 XP and 25 Diamonds
 Raise Elder Electric to adult (Probably)