Going Down? Fall 65 yards achievement

I was thrilled because I thought I had found a use for engineering: My trusty old parachute cloak could allow me to fall 65 yards without dying for sure! After repeated attempts, however, I've found that I cannot seem to get credit for the achievement.

Is the cloak not an accepted means to complete this achievement? Or is this a glitch? Are bubbling pallies intended to be the only ones who can complete?

Not sure where else to post this...I hope someone has a clue.

Thanks!