There are two ways to get to this, one is by coming back after completing the level, and the other is by slightly cheating your way there, and thereby skipping the entire level.
To slightly cheat your way there, simply grab the short stick and put it under the wall, walk on it and jump across. From there, you will swing your way up the wall until you get on top of it.
https://imgur.com/rdSnp1IFrom the top, climb up the green "shrubs" and jump across to a large platform.
https://imgur.com/KU4TLtTFrom this platform, walk along this platform until you hit some more green shrubs.
https://imgur.com/XQeuu6gOnce you are here, climb up these shrubs and on the top you will find a birds nest with three eggs in it, and your achievement will pop!
https://imgur.com/13jbUmdTo do it the "legit" way, from the upper level of the pyramid you will see these green shrubs attached to the pyramid attached to this tree. Simply climb up the tree until you reach the bird nest.
And from the top of this nest you can simply finish the level by climbing down the tree to the top level of the pyramid and dropping down the hatch