Here is the full list of all 25 Hardware Engineering achievements.
Finished a level under 5 minutes thanks to practicing
Completed a level using logic components only
Have 3:1 ratio of successful tests
Perform more successful than unsuccessful step simulations
Sent a Bug Report
Used an edge detector to generate clock signal
Used a latch to remember signal's past state
Took over half an hour to finish a level
Spent an hour by completing a level
Wasted over two hours, but eventually finished the level
Soldered 30 components, most of them badly
Soldered 100 components
Soldered 250 components
Completed all levels on Digital Logic
Used a microprocessor due to a shortage of storage capacity
Used 30 words of executable words
Used 100 words of executable code
Used 250 words of executable code
Completed a test sequence in the Sandbox mode
Simulated through 30 test steps
Simulated through 70 test steps
Simulated throught 120 test steps
Have 50 successful step simulations
Have 100 successful step simulations
Have 1:3 ratio of successful tests