PC games don't have to do this. Steam doesn't have a policy that achievements must prevent cheating. This is entirely a developer choice.
replyThe main reason cheats have disappeared from mainstream games is because many of them prefer to sell them to you as micro-transactions, item pack DLCs, etc.
Steam has the weakest enforced terms of all the three that I mentioned, but it does have terms in its contract with developers for how Achievements are supposed to unlock.
replyBut most "triple A" games don't just release under Steam's weaker terms, they also want Xbox and PlayStation certification, which have been strongly enforced.
I don't know how common it is, but Control (PS4 era) has an extensive cheat system accessible from the options menu, and Saros (PS5 era) has a wide variety of settings to make the game more or less difficult.
replySteam Achievements are trivially to cheat at for most games, especially single-player like Ecco, for example via SAM.
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