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