Where are Halo MCC saves?

Save game data locationSystemLocationMicrosoft Store%LOCALAPPDATA% /Packages/Microsoft.Chelan_8wekyb3d8bbwe/SystemAppData/wgs/Steam /userdata/ /976730/remote/ /Saves/Steam Play (Linux) /steamapps/compatdata/ 976730 /pfx/ [Note 1]

What happens in Halo Reach?

The game takes place in the year 2552, where humanity is locked in a war with the alien Covenant. Players control Noble Six, a member of an elite supersoldier squad, when the human world known as Reach falls under Covenant attack.