This is a skill point.
This trophy occurs on Planet Gaspar. The first thing you want to do is fly to this planet, once getting out of your ship at the start, turn around and walk to the edge of the cliff. You will notice a little path, go down this to reach another path which leads to a lava area. You now need to go across this lava area by jumping on the metal islands in the lava. You will notice the first Blarg Ship now, it's attached to a fuel pump. Shoot the pump with any weapon to destroy it. Now look on the other side of the ship you just destroyed, there is another ship. Do the same as before to destroy it. You now need to move to the second island by navigating the lava, once you reach the island just kill the enemies here and move to the third island as there is no ships here. Once you reach the third island, go up the slope to reach the third ship (look down to see it), use the devastator to destroy it. Now go to the highest point and use the heli glide to reach the forth island. There are 2 ships on this island to destroy, adding the total to 5. Once you have destroyed the two, a path will clear so you can reach the final 5th island. There are 4 ships on this island attached to fuel tanks, destroy them all and that is all 9 destroyed. The skill point and trophy will unlock shortly afterwards.