Amazing Superhero Squad (US)
20 Achievements
PS5
The Rat King
Fail rat invasion mission
19.4%
How to unlock the The Rat King achievement in Amazing Superhero Squad - Definitive Guide
You need to fail the "Rat In The Elevator" mission. It appears randomly as I've had it show up in the 1st and 3rd acts. To guarantee a fail, don't assign anyone to it and just fast forward (LT) to the end of the day.