This morning I was doing some Rift Instant Adventures and out of the blue a mount decided to drop. It was the Black Tail Vaiyuu Reins, I believe this is the random mount that was supposed to drop from the Christmas World Event that just ended a few days ago.
Update: it turns out that this mount is a specific drop from Shimmersand Instant Adventures. It has a low drop rate and it’s only gained by doing instant adventures.
On the bright side, you will finish your Shimmersan Adventurerest ! achievement by the time you will get this mount. Nonetheless Instant Adventures are a great way to earn XP for your Planar Attunement tree.
I didn’t think it was obtainable anymore, or maybe it’s just a different mount, I can’t remember exactly but I finally got “Stable Master” Achievement ! Now I’m missing only a few rares for Ultimate Hunter Achievement, some PvP ones and some Raid Achievements and that’s all. Trion needs to give more achievements.