Achievements for the skyscale are seemingly never-ending
I'm doing the achievements for the skyscale and the achievements never stop. Can't wait to regret doing this before the expansion drops. Also I think I hate Gorrik now.
I think when you have unlocked the Skyscale and/or the Griffon before and combine this with the SotO Masteries you get extra benefits like mounted ley line gliding.
I think the Skyscale is a good example of how a reward should be. You have to work for it and it makes a big difference when you finally get it.
I did the collection(s) on two accounts and I knew beforehand that it woudl take a while. The GW2Wiki has all the information you need. So I worked my way through it without any rush, making a bit of progress (almost) every day. Nothing was unreasonable hard or expensive ...
... and both times it felt great to unlock and even more to actually use the Skyscale. (Sorry, Bunny!)
The position rewinder was a big help. I went with Skyscale before I got griffon. It was fine with the rewinder to help get things. I was taking forever to find things initially. I used tekkits plug in through TaCo. It was amazing to help find the things I needed.