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