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