At a glance
XCOM 2 has a Mac version: Steam sells it for macOS. The Mac requirements list only Intel: on Apple Silicon Rosetta 2 runs it, and old Mac versions sometimes do not start on current macOS. Try it in Steam for Mac first.
XCOM 2 came out on Steam on 4 February 2016, made by Firaxis Games.
Mac version by Feral Interactive.
What your Mac needs
The Mac requirements list only Intel.
Minimum macOS in the Steam requirements: 10.13.6.
Steam requirements list at least 8 GB of memory for XCOM 2.
Allow about 45 GB of disk space for the Mac version.
How to play
Open Steam for Mac and install XCOM 2 as usual.
If the Mac version will not start, you can install the Windows version through Uncork: download Uncork, sign in to Steam and install XCOM 2 from there (45 GB). We have not tested it ourselves.
The Windows version through Uncork needs a Mac with Apple Silicon (M1 or newer).
XCOM 2 uses DirectX 11: Uncork renders it with D3DMetal.