Through a little research, I believe RT is the only RPG currently, which is unfortunate because I think it’s a great way to soak up the setting.
I have my eye on Mechanicus, because it looks very XCOM influenced. I like the smaller-scale squad-based tactics much more than the army-scale grand strategy/RTS style.
Any other suggestions? I know because of what the original game is, the RTS ones are probably going to be the majority of the PC titles, but there seems to be some representation in just about any genre. I even saw an Ork dogfighting (planes) game.
This is a great list. A couple to add:
Necromunda is an FPS which plays like Titanfall 2 in 40k, so excellent moment to moment gameplay, some really cool levels and set pieces highly recommended.
The proper old school Fire Warrior which is an FPS I played probably 15 years ago no idea if it holds up today.
If you have VR Battle Sister was pretty fun nothing special but holding and using a bolt gun up close was awesome.