This is how you get the Outdated Tech Achievement.
First, build a Third Tier Bandido Barracks
Purchase the Techmaster Band from the Barracks and equip the band
Go to a Checkpoint, these usually only have 1 alarm
Go to the alarm and Sabotage it
Start the fight and wait till a guard goes to the alarm.
You can watch my video, it will help you with getting the achievement.
Thanks
KP