Here is the full list of all 25 Hardware Engineering achievements.
Perform more successful than unsuccessful step simulations
Finished a level under 5 minutes thanks to practicing
Simulated through 30 test steps
Completed a level using logic components only
Have 1:3 ratio of successful tests
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 70 test steps
Simulated throught 120 test steps
Have 50 successful step simulations
Have 100 successful step simulations
Have 3:1 ratio of successful tests