Okay here is quick explanation.
1 Private Scout - 2,000 HKs
2 Corporal Grunt - 2,000 HKs
3 Sergeant Sergeant - 2,000 HKs
4 Master Sergeant / Senior Sergeant - 2,000 HKs
5 Sergeant Major / First Sergeant - 2,000 HKs
6 Knight / Stone Guard - 2,000 HKs
7 Knight-Lieutenant / Blood Guard - 2,000 HKs
8 Knight-Captain / Legionnaire - 2,000 HKs
9 Knight-Champion / Centurion - 2,000 HKs
10 Lieutenant / Commander Champion - 2,000 HKs
11 Commander / Lieutenant General - 2,000 HKs
12 Marshal / General - 2,000 Hks
13 Field Marshal / Warlord - 3,000 HKs
14 Grand Marshal / High Warlord - 3,000 HKs
In total to reach rank "14" you need 30k of HK's.
Also note : You gotta be alliance when you are about to get rank as they are only scripted for alliance, so if your are horde for example and you get 2k kills, swap to alliance get one kill and you will achieve rank [Or it was like that back on AT].
Hks = Honorable kills
Quick summery :
[AT Isle tittles back in ages - 1k badges = 1 tittle (last 2 tittles for 2k badges]
[AT when isle died, 1k rele badges = 1 tittle [lasted untill they revived isle]
[AT right now, 2k HKs = 1 tittle]
Note no.2 : Isle WONT give you ranks, that was ages ago[Same thing with badges].
Only kills.