Is there any way to recover saves?

I was trying to do The new achievement, “The Rarest Specimen” I saved and started up a new game, but accidentally I quicksaved too much and my progress with the hat is gone, it doesn’t show up in the “Load game” menu. So, is there any way to bring those saves back?

No need to recover the save.

You could check if an older save is still present in Steam Cloud, where you can download it:

If Black Mesa is still running, don’t quit it yet, or the older saves will likely be deleted/overwritten in Steam Cloud.

This only applies if Steam Cloud synchronization is enabled for Black Mesa (which is it usually is unless you disabled it.)

Thanks to both of you guys.

Founded in 2004, became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.