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