An easy achievement that can be obtained very early on.
Wait until you have an oculi you don't really want/need, or one you have a surplus of.
From the Menu select Oculi, then select a piece of equipment (as though you were going to add an oculi to it).
Highlight the oculi you wish to send to a friend, it can be anything; even the lowest level ones. Hit X while highlighting your chosen oculi, and a pop up will appear containing a list of your xbox live friends. Simply select a friend to receive the gift and confirm when prompted.
NOTE: The recipient does NOT need to be playing, or even own child of light. You can literally send it to anyone on your list.
The achievement will pop immediately after sending the gift.
UPDATE: previous bug where having 100+ friends seemed to break in the in game functionality to send gifts appears to be fixed.