This one took me a while. I could have sworn I got much more than 25 segments on many occasions.
***The trick to this is NOT to collect the triangular shaped food that gives you the red orbs. Each one that you eat actually increases the amount of food that you have to eat to grow a new segment by 3-5.***
The way I eventually did it was using the Spin creature. It's level is very simple and does not have any hostile creatures. Continue until the last level. You should get the trophy before collecting the Level Seed.
Credit to Yosho-sama on the PS forums.