XCOM 2
87 Achievements
GOG
Defender of Humanity
Overthrow the aliens on Commander difficulty
3.3%
How to unlock the Defender of Humanity achievement in XCOM 2 - Definitive Guide
Cassylvania, JAKKRIEG
Commander is the "hard" difficulty of the game and it certainly lives up to its name. Your soldiers begin with only 4 health, while enemies have more health and a longer line of sight. In order to unlock this trophy, you must play through the entire campaign on Commander or higher. Changing the difficulty mid-game and then changing it back will negate this trophy!
See the "Tips for Surviving XCOM 2" section of the Road Map for more information: LINK