Here is the full list of all 20 Extraction: Project Outbreak achievements worth 200 gamerscore.
Save 25 scientists.
Killed 100 enemies with Missile Drones.
Bought every weapon and fully upgraded it.
Deployed all 4 special weapons, 10 times each.
Hit 100 enemies with Defectant Gas.
Repair 25 weapons installations.
Kill 50 enemies using the Melee attack.
Complete the game.
Kill 25 enemies with exploding objects.
Levelled up to Elite Level.
Escort 25 soldiers to their destination.
Killed 100 enemies with Droids.
Killed 2000 enemies.
Earned 500,000 credits.
Killed 100 enemies with Sentry Guns.
Killed 50 enemies with grenades.
Killed 500 enemies.
Killed 50 enemies with skill shots.
Killed 150 enemies.
Earned the best Reputation level.