Bubble Buster: Finish level 27 without setting off a bubble that strikes the ceiling
This trophy is quite simple, if not a little vague/misleading. The trophy means that you need to beat the level without lowering the ceiling via the red exploding enemy featured in the trophy image.
Luckily there is only a single mine enemy in the level (the target to avoid), and it is very easily dispatched right away. All you have to do is to use the piercing bubbles the game gives you right from the onset of the level, and destroy the mine with that, so it won't activate. With the mine out of the way, it's as simple as finishing the rest of the level.