Fast travel to Aurora and head to the temple. Talk to Priestess Mara to learn that you need to collect several flowers scattered throughout the desert. Check the Auroran Blooms collectibles section to learn more of the flowers' individual location. There are a total of 30 flowers you need to collect, 5 for each color. You don't need to collect them all as this is considered to be a long collectible quest, like the gnomes and rare books.
Guild Seals: 10 per color, 10 completing the quest. (Total of 70GS)
Flower Power Achievement