Warning, spoilers ahead to unlock terminal!!
*** Spoiler - click to reveal ***
Unlock terminal:
Open music widget and press:
next, play, play, previous, next, previous, play, previous, next
If you don't see buttons on the music player, try and change your resolution, at this moment there is a bug with the music player in some resolutions.
Within the terminal go to:
Spectrum > Command > CMDS > And click on the blue line: config steam. Put the achievement on [true]