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