In order for you to play HITMAN on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
macOS 10.14
Processor (CPU):
2.0Ghz Intel Core i5
Memory (RAM):
8 GB RAM
Graphics Card:
2GB AMD R9 M290, 2GB Nvidia 680MX (requires macOS 10.13.4 or later), 1.5GB Intel Iris Graphics 540 (requires macOS 10.13.4 or later)
Storage:
81 GB available space