I was reading This Thread on the Achievement Forum, And curious as to why as well why there is no achievement being added for collecting 450 mounts as well.
Most of the mount achievements for collecting lots of mounts have been for every 50 mounts obtained on your characters! So I’m unsure as to why a 450 collected achieve isn’t being added, While the 500 one is.
If a 450 achievement is indeed added, I would love if we got a cool looking flying mount like stated in the thread I linked! 
Id honestly take the otter at 450 if they changed the 500 to something better
A spinning disk with windows on it that can seat 1-3 players.
At this point I would take a table that seats two people that flys around and acts as a feast
More: A rideable comet with trail of ice crystals behind it, rideable thundercloud with storm occurring beneath , rideable rainbow, rideable solar system, rideable Venus flytrap that looks like Audrey ll from Little Shop of Horrors, rideable octopus, rideable eyeball, a rideable golden throne inlaid with precious gems and with a trail of sparkles behind it, rideable Fiona’s caravan wagon multi-person mount with special guests who accompany you such as Fiona who offers you goods and repair services, a floating magical painting that absorbs the player causing them to be part of a random scene from Warcraft lore
Bruh i had no idea i wanted that
Thank you Blizzard for updating the Otter to fly and the new appearance is GREAT!
Agreed! I saw the new appearance for the 500 mounts collected reward! Looking forward to getting it as soon as the achievement itself goes Live. I’m actually getting very close to 600 usable mounts on my main already!
We’re happy that you’re enjoying the updated visuals to the ottuk mount!
In addition to flying, this talented ottuk is also a quick swimmer.
Happy collecting!
Just to ask cause this worries me:
Will this suffer the fate of other Swim Speed mounts like the Aurelids or Nazjatar Underwater Mount in the Ground/Sky? AKA Not able to use mount equipment?
Cause I can’t speak for everyone, but I’d much rather be able to have water walking, anti-daze, etc. equipped than increased swim speed.