What does the achievement of "Stand Your Ground" mean?

[petr0vich-13]

There is a achievement which called "Stand Your Ground".And it says “ Destroy 150 enemy craft with the GATLING:PIERCE”, but I still can't get this achievement.

[SillyWalk]

Pierce is the charged attack of the gatling. The same goes for winder:radiate and lock-on:cascade.

[petr0vich-13]

need to destroy in one scene or considered to be the total number?

[SillyWalk]

In total.

[Ponxha]

Also it's only with the standard fighter.