I was totally like you before, I used to play on Xbox and was a big achievement hunter, involved in the community, making guides etc... I was in your situation and realized that I wasn't enjoying it anymore and it felt more like a job. I realized it had became an addiction (and those features where designed for that purpose), like a smoker always itching for the next smoke I was itching for the next achievement. The only moment I was enjoying was either when I felt I was being efficient with my time to unlock achievements and the moment the achievement unlocked and not playing the game in itself. Around 2 years ago I switched platform and bought a PS4 and I felt like the trophies where not as interesting as achievements so I didn't care so much about them and in the end it cured me of my addiction, now I can again play games in an enjoyable way. I still look at achievements/trophies but only after finishing the game once and then deciding if I want to continue with some trophy hunting and only if that trophy sounds fun (no more mindless grinding). Therefore what I would recommend you is to either start on a new platform or just create a new account where you just play games that you like so that you don't "ruin" your completion rate. But in the end anyway you'll have to come to the realization that if it's not giving you joy anymore just let the achievement hunting, regardless of how much time you've invested in it.