I'm also on the spectrum. Sometimes I think the spectrum is so wide as to be functionally useless for describing behavior. I feel like my comment maybe implied that I think less of people that feel compelled to 100% games, which is not the case. I just have different compulsions.

I've been gaming for over 30 years, and probably have thousands of games in my digital library. I don't think I've gotten all of the achievements in any of them. I tend to predominantly play rpg's, and other games with a strong narrative bent, and I try not to peek at the achievements, so as to avoid spoilers. I appreciate when the developers hide them, so it isn't an issue.

I've seen many people argue that achievements have had a net negative effect on gaming, and I tend to agree, but I don't really have strong feelings about it, since it typically doesn't affect my experience very much.