Nothing you said detracts from my claim. It's not logical to make the jump from the claim that "capitalism is the cause of the need for achievement in our society" to "no other socioeconomic system causes the need for achievement."Not sure if I understand your claim correctly, but I sure hope that I don't because the idea that you seem to have in mind strikes me as implausible. Although I would agree that the modern culture of capitalism encourages people to 'achieve', I don't know if the resultant dilemma should be attributed solely to capitalism. Non-capitalistic societies have also been known to push people to 'achieve', though for different reasons. A capitalistic family is likely to encourage their children to attain this or that position of status to earn prosperity, yet a communist or a fascist can push their son/daughter to perform for the glory of the state or the dear leader. For example, many schools of the Soviet Union preached that the teachers should be proud of the fact that their students routinely outperform American students in mathematical competitions. Students who underperform are chastized severely and derided as the shame of their respective communities, I've even attended one of thos academies until I turned 11.
Although as you noted capitalism does have a need to reproduce itself, but can't the same be said about any sociopolitical system? Surely communists and fascists attempt to futher promote their system by means that are often more viscious than those employed by the capitalists. Although capitalisms does have a potent way of motivating students to do well by promising prosperity and status, communistic socities have been known to do the same by explicit coercion. Today, we may notice that many wealthy North Korean fathers send their children to the universities so they may learn and grow for the glory of the dear leader.
It seems to me that any system will reproduce itself and its proponents will attempt to compel the public to do its bidding. Self-reproducing is an inevitable move, its a way of sociopolitical survival. The problem is not with capitalism, communism, fascism or any other social, political or economical system of thought, the problem is with people thoughtlessly buying into the popular creed of their societies. Unfortunately, I don't know if this problem can be solved as the common folk have not displayed a great ability or enthusiasm with respect to critical thought at any point in history and that's unlikely to change in the near future. If I had to hazard a guess, the best way to bring about the desirable alterations is by radically restructuring the educational system where young students will be taught to think critically and autonomously instead of merely regurgitating what they've been taught. Yet, can anyone even begin to imagine the ruckus this plan would cause? Universities would fast go bankrupt if they accepted such a plan because very few students would be interested in receiving such an education. Similarly, many teachers would likely be terminated due to their own incompetence at thinking critically and utter hostility to the very idea that students should think for themselves.