Habroxia 2

Story Related. 

The Rogue Defender is Magni and is found at the end of 4A (unlocked after you complete Level 3A). For the first half of the level, they'll make a loop around the edge of the area going clockwise. Stay close behind them and just fire away. Make sure you're not flying in front of them as they do fire projectiles in your direction. Be sure to also do your best to dodge the randomly flying asteroids, especially when you're on the right since they'll be harder to see coming. Once the boss reaches 50%, they'll face the left and still start shooting at you. They'll shoot orbs, arcs and homing missiles in your direction that'll you'll need to dodge. Every few seconds, a drill will appear on the front. When it does, they'll rush in your direction to try and hit you with it. Move out of the way and use boost () if you need. They'll move back towards the right and continue shooting at you. Repeat this process and once you've defeated them, the trophy will unlock. 

While this boss does have a lot of asteroids flying around them, it's not recommended you try for Unattainable  here since there's just a lot going on and a lot of stuff to dodge.