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 scenario.
Run the hamster for a total of 1,000 miles.
Knock out Tim 5,000 times.
Accumulate 10,000 total basketball bounces.
Edit a community contraption from the Workshop.
Make & publish a contraption with at least 20 parts.
Make & publish a puzzle with at least 20 parts.
Solve 30 community puzzles.
Run the hamster for a total of 500 miles.
Solve 220 official puzzles.
Blow up 500 cumulative tons of explosives.
Kill 15,000 zombies.
Pop a total of 2,500 balloons.
Solve 150 official puzzles.
Solve 100 official puzzles.
Solve 50 official puzzles.
Solve your first official puzzle.
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.