Guild Wars 2

As the title says, did anyone the achievement ‘Air Superiority’ the last days?
It seems to be bugged, because i did i several times and didnt get the achievement. Tried it from different positions, activated Bitter Harvest and/or Hearts and Minds in the chronik, did it with and without gliding, with and without dying but still didnt get it.
I read that there is an WP on the top, but i dont have it. Do i have to complete bitter harvest first to get that WP and the achievement?

I completed it in January, so somewhat recently.

• Make sure that you’re in the Bitter Harvest story instance, the one where you have to knock down gates to climb the helix.
• There is no way point at the top, so if you die, you’ll have to run all the way back up the helix.
• Judging by my edit on the wiki, you can jump from the flat, circular stump portions, and you can deploy your wings to help.
• You can fight Faolain before trying the jump, just make sure to not leave the instance.