Here is the full list of all 11 Hacknet achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
That's just impolite
Master of /el's friendly community
Disconnect from a traced system with less than half a second to spare
Run Clock.exe
Complete Bit's final request
Complete the tutorial earlier than normal
Be granted an account within CSEC
Be granted an account within Entropy
Purchase the final PointClicker upgrade
Have a truly absurd number of pointclicker points
Run ThemeSwitcher