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Mrrl's Secret Stash
Obtain one of Mrrl's more elusive wares.
Mrrl's Secret Stash is earned by purchasing the 
Crimson Tidestallion from Mrrl, with the achievement granted the instant the mount is bought.
Equip Azsh'ari Stormsurger Cape
You must be wearing the 
Azsh'ari Stormsurger Cape to see the Crimson Tidestallion in Mrrl's inventory. If you don't have one, purchase a 
Benthic Cloak from either the Alliance or Horde base for 5 Prismatic Mana Pearls each — RNG determines which cloak you receive, so multiple purchases may be required.
Check Mrrl's Inventory Daily
With the cape equipped, visit Mrrl — Alliance players can find him at 39.1, 54.3, next to the Bounty Board near the large shark in the middle of the camp — and check whether the Crimson Tidestallion is available, as it does not appear every day.
Buy the Crimson Tidestallion
When the Crimson Tidestallion appears in Mrrl's shop, purchase it to immediately receive the achievement; do not buy any other secret item from Mrrl beforehand on the character you want the achievement on, as doing so can prevent the mount from appearing for that character.
Tips
The achievement is account-wide on live servers, so only one character needs to complete the purchase.
If the Crimson Tidestallion is not appearing for your character, use the Group Finder to join another player's instance where it is available, then purchase it there.