Disarm 20 enemies
Just disarm 20 enemies. You learn how to do this in the tutorial. There are significant amounts of enemies throughout the campaign. Just try this trick until you get it. I do not use it to much, especially in speed runs, as it slows you down. This achievement has been reported to be glitchy by some and does not unlock after disarming 20 enemies and requires more disarms or a complete game uninstall and reattempt to unlock.