You can use these cheats to speed up the process, go to Options > Cheats to enter them, note they are a one time use only
, every character will get the sprockets and yes achievements will still unlock 10000 Bonus Sprockets
- Left + Right + Left + Right + Down + Down2500 Bonus Sprockets
- Down + Up + Right + Left + Left + Down1250 Bonus Sprockets
- Left + Up + Down + Down + Down + Up
Use the D-pad to enter the codes, thanks to gamefaqs user playablepassion for the codes.