Achievement - Vault of the Incarnates - still ignored

I joined LFR and they were at 2nd boss. We killed it. I got my progress towards my achie and I left.
My progress was gone. I joined again, killed first boss and we disbanded. I lost my progress from 1st boss.

Why? I want my achie back -_- as I killed both.

It is a known issue, I recommend doing all the bosses first and then submit a ticket for assistance:

Add the date/time and killed boss difficulties so they can find it easier in the logs.

so how long it will get this achie? still waiting :-x