You only get each achievement once. Generally there are several achievements at different levels in each category. As you accumulate more activity, you reach a higher achievement that results in more points.
In some cases, like replies marked as helpful, you get 5 points every time this happens, but that is not an achievement, meaning you don't get a "badge" or "medal" for it (except maybe the first time).
Do you have a specific example?
Richard Mueller - MVP Enterprise Mobility (Identity and Access)