I am not following you. What do you mean?
There are only so many levels to each achievement.
In the case of the "kill a GV by plane", and Im only guessing here at the levels as I only have one star....
10 gv kills 10 points
25 gv kills 25 points
50 gv kills 50 points
100 gv kills 100 points
other may only have two levels....
drop the troop to win the war, 100 points
drop the troop to win the war again 250 points.
Once you get to the end of the levels you can no longer add more points doing that action.