Achievement System and hide complete task

[larhalt82]

Since I want to add a multiple step achievement (i.e. 5 dogs --> 20 dogs --> 50 dogs and so on)
it's possible to hide the completed step and show the next?
I tried with this code

var achieve2 = new HunterAchievement(90, 14, 0x25D1, false, null, 5, "Dog Slayer", "Slay 5 Dogs", 5, typeof(Dog), typeof(Gold));
Achievements.Add(achieve2);
Achievements.Add(new HunterAchievement(91, 14, 0x25D1, false, achieve2, 10, "Dog Slayer", "Slay 10 Dogs", 10, typeof(Dog), typeof(Gold)));

But I got this (I also tried to set the same case like 90, but was a mess )