Here is the full list of all 11 Inspector Gadget - there are MAD Time Party achievements.
Finish the game
Free the city center
Free the residential neighborhood
Free the park
Free the port district
Complete all mission orders given by Chief Quimby
Complete all missions given by Penny
Meet your ancestors
Use the Gadget-Copter for the first time
Use the Gadget-Umbrella for the first time
Use the Gadget-Roller Skates for the first time