I assume this is in the context of a discussion or conversation. The sentence "Each point was reached." means that everything that was planned to be talked about in the whole conversation was talked about. The fragment "each reached point" is like a descriptive phrase which needs more information to be a full sentence (e.g. "Each reached point was important." = everything that was talked about was important). The sentence "Each (person) reached their point." would mean that every person in the conversation said the thing that they wanted to say.