Use every ability at least once (excluding Overshield and Seeker Drone)

This achievement is exclusive to the Single Player Campaign and will unlock once you have used each of the following armor abilities at least once:

-Regen Shield
-Auto Sentry (Costs 500 XP per mission)
-Overshield (Cost 300 XP per mission)
-Seeker Drone (Cost 800 XP per mission)
-Hologram
-Sprint
-Stun Blast
-Active Camouflage
-Hardlight Shield

Remember, the Auto Sentery, Overshield, and Seeker Drone must be purchased in the pre-game lobby of a mission. All the other armor abilities will either be a default starting AA or be found throughout the map for a particular mission.