For the people who have missing achievements from Ep.1 and 2 with the new update, this is how they are imported to the new HL2 update (worked for me): -Search for both ep.1 and ep2. in your library (now showed in the tools instead of games) -Click install for both (if you already installed the new HL2 update, it won't download anything) -Launch each for once -Now launch the new HL2, and all missing achievements will pop up in the updated version