The Police Archives are a place within the local police department. There are multiple achievement opportunities here, including:
Acquire a map.
In Adine's second date, she will ask the protagonist about a map. Afterwards, this achievement can be gotten by studying the blueprint in the police archives.
Find a mysterious base.
Search the trash in the police archives.
Play a prank on Bryce.
Available at the police archives.
Visit the police archives and help Katsuharu with his cart.