Welcome to the comprehensive guide for unlocking all achievements in Animal Spa. This guide is designed to provide clear and concise instructions to help you achieve all the in-game milestones.
Achievements
You just need to get your medals to 24 to claim the first key
You’ll need to max the stats of an employee, I’d recommend maxing the stat of the free employee you came like the maltese, you can get extra employees from the mail
Just fire any employee by clicking the Fire button note that you cannot fire the default employees
play the game at 2am
You’ll need a Promotions Desks (costs 12 stars), set 100% to one species by clicking the icon
Reach Platinum for each medal 32/32
Unlock all normal rarity guests. You must finish the Spa Master Achievement (alternatively, you can interact with friends) to unlock the initial variation of each animal
Unlock all letters in the Mailbox, just keep playing it’ll get unlocked in no time with except to the Animal City Hall as it needs user action, more info below
break the gold counter, reach gold over 9999999
get 24 medals on a stage/area to unlock the next one then repeat till you’ve unlocked 8 areas
Animal Codex

The normal rated (Gray Colored) are usually unlocked by getting Platinum medal on each category or interacting with friends and just waiting for the animal to visit the spa multiple times
Mail Guide (Animal City Hall)

For the other mails, I recommend upgrading all Medals to Platinum to unlock the necessary animals for them to visit your spa. After unlocking the animals, the mails depend on random chance and will occur as you play the game