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