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Hard Boiled
Lay an egg in Un'Goro Crater's Golakka Hot Springs as a rabbit during the Noblegarden celebration.
Hard Boiled requires you to lay an egg at Golakka Hot Springs in Un'Goro Crater while transformed into a Noblegarden Bunny during the Noblegarden holiday event.
Obtain the Bunny Buff
Open 
Brightly Colored Eggs until you receive the buff that transforms you into a Noblegarden Bunny. This buff can be found in Noblegarden starting zones during the event.
Travel to Un'Goro Crater
While transformed, travel to Golakka Hot Springs at 37, 59 in Un'Goro Crater. You can safely use your 
Hearthstone, Dalaran portals, or the 
Ultrasafe Transporter: Gadgetzan without breaking the polymorph, but mounting will cancel the buff, so plan your route accordingly.
Stand Still in Shallow Water
At Golakka Hot Springs at 37, 59 in Un'Goro Crater, stand still in the shallow water — do not swim, as the bunny will not lay an egg while swimming. Avoid taking any damage, as falling damage and other damage will break the polymorph. After standing still for a couple of minutes, your bunny will lay an egg and the achievement will complete. Druids can also lay an egg while in flight form high above the springs at 29.49, 45.59.
Tips
If you are a Hunter, activating Aspect of the Pack or Aspect of the Cheetah before receiving the polymorph buff will keep it active during the transformation, though you cannot switch aspects while polymorphed.
See the video guide for a full walkthrough of the route and hot springs location.