So, after a long time tracking down the Ahankara Eggs and bones I was able to get all of them. That was what I thought the moment the counter reach 40 and I got the triumph, but then, the sparrow didn't unlock. After that I took a look into Braytech.org and it shown one missing, the one after the thrall run on Shattered Throne. So, I went there, but it's no where to be found, and my counter in-game says that I have all. Is this a common thing