Lara Croft and the Guardian of Light

(Steam Sync) Save Location
The (XXXXXXXX) represents your unique 8 or 9 character Steam ID, and although the game ID for me was 35150, I found it listed as 35130 on more than one other site.

C:\Program Files (x86)\Steam\userdata\XXXXXXXX\35150\remote\autosave.lcgolsave