There are many special achievements in "Sonic There are a total of 80 rocket parts, or "machine parts," scattered throughout the white space.
How to complete the Sonic Chat Generations Reboot Rocket achievement?
The rocket is completed
Deliver all rocket parts to Orbot and Cubot.
There are a total of 80 rocket parts, or "machine parts" in the game, scattered throughout the white space. They're not particularly hard to find, as they have a unique aura and are usually found outdoors, which means you can find most, if not all, of them if you're curious enough to just look around.