Powered by MJOLNIR Achievement
Powered by MJOLNIR10
Use every armor ability at least once (excluding Overshield and Seeker Drone)
Press Q to use an armor ability
Auto Sentry (Costs 500 XP per mission)
You'll get all of these at the start of at least one mission, and you can also find them all scattered throughout the game, appearing in the order they're listed in.