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I see you don't own HL2 in your steam library, that would also be an obvious issue.
https://steamdb.info/app/220/
Half-Life 2 (alongside all of Valves games) regularly goes on sales, often -90% off, just wait for the next sale which no doubt is coming in a few months and get it cheap and you won't have any more of these issues with custom (won't say pirated since this is technically free) unsupported versions.
If you're determined to get achievements with some other version, maybe go ask the other people from whom you downloaded that version about achievements that the EZ2 devs don't support.
Or do what other cheaters do and google "Steam Achievement Manager" if you just want achievements by any means necessary. (Not judging BTW, you want to cheat then it's your freedom, it's a single player game)