I’m legitimately asking for social progress anarchists have achieved in their own projects. If we go by the metric that several groups took part in struggles (despite the struggles I listed above being led by marxist-leninist principles), then it would be fair to say there were marxists taking part in anarchist struggles like in Spain, and then that would mean we can’t ever point to a group’s achievement because it was achieved with the help of thousand of different people.

iirc bolshevik means minority

Yeah probably… I don’t know Russian haha. But by the time of the October Revolution they were the majority, otherwise they would have never had the momentum needed to actually achieve the revolution. And yes, probably there were anarchists and even social-democrats (the bolsheviks were after all the leftmost faction of the socialist party of Russia) in their ranks who may have thought “look I don’t entirely agree but this is as good as it’s gonna get”. Like I said earlier, what matters is that the bolsheviks (to name just them) worked on marxist(-leninist) principles. They would not have let a socdem take a cadre position and do socdem stuff (advocate for electoralism, appeal to both sides to stop the hostilities…).

If you’re interested in learning how a vanguard party works (the vanguard party, as I’ve learned recently, is only the party that is successful, it’s not a title you decide for yourself but something that happens to you), Harman wrote a bit about it in his book: https://www.marxists.org/archive/harman/1979/marxism/ch10.html