Robotron 2084
12 Achievements
200
Xbox 360
Save All Humans!
Rescue all humans on wave 1 and 2 using default settings
10
How to unlock the Save All Humans! achievement in Robotron 2084 - Definitive Guide
As soon as levels 1 and 2 start, move towards the humans. Shoot the enemies as you approach to make sure that they don't kill the humans you're trying to save, but DON'T kill all of the enemies. If you do, you will end the round immediately to move onto the next one and you will be unable to save all the remaining humans.
Right off the bat, go straight for the humans. Make sure you do not kill all enemies as this will automatically warp you to the next level and you will not be able to save the remaining humans. Do this on levels 1 and 2 to get this achievement.