This was changed after Nov 2021.
The map you are looking for is Lery's. This is a mostly indoor map.
For the achievement, you need to repair the central generator in the "treatment" area. The area has surgical chairs, monitors and an area above it that can reached via stairs.
Like all map achievements, you have to be repairing the generator during the final seconds of repairing only. Then you must escape the match. If the killer disconnects, it will not count. Hatch escape should count but hatch escapes have historically been buggy for map related achievements.