These eggs are mostly at the Ordon territory, and without the cape, only by Albatross are these easiest obtainable.
But if you go to the sanctuary's graveyard, and run cross the small lake there, you will see a Firestorm Egg guarded by a Crimsonscale Firestorm.
You will not be able to get up to the egg and loot it, but if you just jump towards it and click it when in range, you get credited for the achivement.
And don't worry, the mob won't attack![]()