This achievement has a different locked and unlocked description. The locked description is: "Shoot down a spire missile with a blast while hovering."
Once you have the blast ability select it by pressing
, and collect enough soul clusters to buy the hover upgrade for your Flight Arcane Power.
Find a spire which become unlocked a little way in to the story, and give yourself a little room to line up the shot. Do a charged jump by holding
and once in the air, hold
to hover, and then watch for the missile to come towards you and press
to use your blast ability to shoot it down.
If you've destroyed all the spires before you get this, https://www.trueachievements.com/BL4CK+SiLvA.htm
left this in the comments.
If you already cleared all the spires (like I did) You can still get this achievement by using your summon ability to summon your own spire tower.
I hovered above my summoned tower with the heat level at 5 and as soon as the spire started shooting flying demons I used the blast ability on the missile and the achievement unlocked.