PixelJunk Shooter

There is no real easy way to do this, I recommend just going threw the game. You should get Cave Cleaner Supreme by the end of Episode 2 or beginning of Episode 3.

I did find one good grinding spot in the game. It is in the level Gaseous Exposure in Episode 1. The spot is in the second area of the level. In that area there is a spot where four enemies are in a gas bubble with a lava chamber above them. Kill the two enemies on the way to that spot and then when you get there hit the chamber with a missile killing all four enemies at once, then kill yourself. Rinse and repeat, I racked up 150 enemy kills in 8 minutes, so if you have about 45 minutes to kill you could easily get this trophy. Here is a video showing my method: