*Note: This solution is mainly regarding scoring in this game, as opposed to long-term strategy. For that, you can go to http://www.hexic.info/index.html
Onto my solution.
Because this achievement only requires 75,000 points, you can get it most of it in a single move. In the first few levels, try to make as many starflowers as possible without clustering any of them. Once you have 6 starflowers, move them into position where they can be turned into a black pearl in a single move. When you make a black pearl, you will get 10,000*[level] points. By the time I reached level 4, I had just under 25,000 points with the 6-star flowers ready and waiting to be made into a pearl.
To get to level 5, I simply made regular combos on the other side of the board, away from the starflower, until I had made enough combos to get to level 5. by this time, I had 25,000 points and so I made my pearl. This got me an added 50,000 points which added up nicely to just over 75,000 points. Bam, achievement unlocked.
Also, depending on which pieces you use to make your starflowers, and at what levels you make your star flowers, you could easily have 35,000 points by level 4. Using multiplier pieces for your starflowers in higher levels really gets you points quickly, and you might not even need to make a pearl.
Of course, make sure bombs are #1 priority when they show up.
I hope this helps :)