Here is the full list of all 8 Crazy Machines: Golden Gears achievements.
Solve all challenges with 3 stars.
Reach Genius level 25.
Upload 5 different challenges.
Download and solve 5 different Community levels.
Blow out a candle and enlighten it again, still air (Editor), 5x.
Run a self-constructed level with a successful level end.
Retry a solved challenge 10 times - each time.
Retry 3 solved challenges and improve their results.