The achievement was recently announced by FunPlus publisher and KingsGroup studio. They did it in honor of the third anniversary of the game.
State of Survival was released in August 2019. According to the AppMagic service, it has earned $1.2 billion since its release. The main markets for the zombie apocalypse project were the USA ($461 million), Germany ($123.9 million) and South Korea ($64.7 million).