Well personally I don’t really want to…
Another way to look at it is that If each stage has 11 achievements (like microbe does currently). Then 1 is already the achievement for reaching the stage, so having a second stage reaching achievement already means that 18% of our achievements are progress achievements.
But still that will cause a permanent problem of eating up achievement slots, even when (I won’t say if) we reach space stage in over a decade. If we add such hard variants of progress achievements now, we’ll be forever stuck with them.