As I'll be using the cheat comand unlocked by getting gold on all levels, having that is a requirement

With this hint you'll be making what I first though as the worst level in the game into the best one

Enter the level Cosmos 4


On the pause menu select Options > Cheats and activate "Go Through Walls" and "Invencibility"
You can also activate "Gravity Well" to help line up later


Now you can forget the fear of falling into the black hole.
Eat enough to be larger than it and just sit on top of it [here gravity well can help you make sure you are centered with the black hole]
Congratulations, now wait for about 2 mins to complete the level with about 500 objects eaten


Rinse, repeat

Edit: You can also use gravity well cheat to drag the black hole away from the center, the stars will continue to fall into the center of the level but without the black hole inside you to be eaten you can get up to 700-800 objects

Obs. Although it says progress wont be saved, you can look at the object count on the achievement to see that it is working