Here is the full list of all 22 Contraption Maker achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Solve your first official puzzle.
Solve 50 official puzzles.
Solve 100 official puzzles.
Solve 150 official puzzles.
Solve 220 official puzzles.
Solve 30 community puzzles.
Make & publish a puzzle with at least 20 parts.
Make & publish a contraption with at least 20 parts.
Edit a community contraption from the Workshop.
Run the hamster for a total of 500 miles.
Run the hamster for a total of 1,000 miles.
Blow up 500 cumulative tons of explosives.
Knock out Tim 5,000 times.
Kill 15,000 zombies.
Pop a total of 2,500 balloons.
Accumulate 10,000 total basketball bounces.
Complete this scenario.
Complete this scenario without using the Dog Bone, Dog Food, Dog Treat, Dog Whistle, or the Cat.
Complete this scenario using only Ropes, Rope Pulleys, Rope Hooks, Teeter Totters, and Bowling Balls.
Solve your first scenario.