In order for you to play Metro: Last Light Redux on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
OS X 10.9.5 Mavericks or newer
Processor (CPU):
3.2 GHz Intel Core i5
Memory (RAM):
8 GB RAM
Graphics Card:
Radeon HD7950 3GB / NVIDIA GeForce GTX 750m 1GB
In order to play Metro: Last Light Redux on macOS with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
OS X 10.9.5 Mavericks or newer
Processor (CPU):
3.2 GHz Intel Core i5
Memory (RAM):
8 GB RAM
Graphics Card:
Radeon HD7950 3GB / NVIDIA GeForce GTX 775m 2GB