After finished playing this game, i will definitely write a walkthrough for all those in pain like me. But first, I need to finished the game.... the "electrolytic cell" seems not the cells I got from the toy train. I tried combining various things but got no progress.
All other items in the checklist have been ticked. The game code is buggy (restart button not work for example) so I don't know if I missed any items not yet discovered or I missed a particularly tricky object combination, or if it's just another game bug.
After following everyone's advices, I still cannot get the 16 swan achievement. Mind you it's hard! Definitely harder than 1million score and 3min endurance.
 "You're Grounded!"){kind=icon}
 "Take a Walk"){kind=icon}
 "Marble Twist"){kind=icon}
 "Transmorpher"){kind=icon}
 "Kingdom of Liars 1"){kind=icon}
 "3 Slices 2"){kind=icon}
 "Robotic Emergence"){kind=icon}
 "Endless Migration"){kind=icon}
That could be a bug for sure. Thanks for let us know that.