In order for you to play Amnesia: The Dark Descent on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
OS X 10.7.5 - 10.15.0. This product is not compatiable with macOS 10.15 Catalina or later.
Processor (CPU):
2.0Ghz
Memory (RAM):
1 GB RAM
Graphics Card:
Radeon X1000/GeForce 6 (Integrated Intel Graphics not supported)
Hard Drive:
2GB space free