Nothing wrong with some achievements to try some new challenges after you think you've done everything, or a leaderboard for some recognition, but then they started to use achievements as lazy alternatives to secrets or rewards that weren't cutscenes as well as uninspired "kill 100 X" chores rather than interesting side quests.
Here's the full story of kikery that achievements influenced:
>2005-2007
>social shit internet becomes popular, ultra-normalfags start pouring into the internet
>(((Microsoft))) thinks its the perfect moment to implement that shit into videogames
>Microdicks create e-peen measuring icons along with a highscore system to give them traction
>people start giving more of a fuck about achievements rather than slowing down and enjoying the games in depth
>going as far as buying and playing shitty half-assed games just to get achievements, similar to diving on a pool of shit to grab a coin
>as achievements gain popularity, consoles start focusing into online aspects, locking them down and turning cheat devices and other console tools into "muh anti-competittib boogiemen"
>Valve also brings that shit into PC along with other 7th-gen console cancers like DLC
>devs no longer need to think of cool secrets and actual rewards for getting hard shit done and instead replace that with achievements for casual newcomers
>their internet-oriented and overly-competitive nature influenced some other cancers in vidya, like E-Sports and Microtransactions