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