Ancestors Trophy in Journey
Find a mysterious creature hidden in the temple.
How to unlock Ancestors
On The Temple stage, light up all the glyphs required to progress. Instead of ending the chapter by sitting on the meditation circle, go back down and explore.
Go towards the bottom of the center beam, two flights up for Ancestors:
Or go to the same place you grabbed Symbol 3 & the Glyph:
There may be other creatures as well, feel free to look around.