Full list of all 10 Outbreak: Epidemic achievements worth 1,000 gamerscore. It takes around 0-1 hour to unlock all of the achievements on Xbox One.
Achievements they've won
Achievements they've not won
Clear Onslaught Mode on any scenario and difficulty.
Defeat an Enforcer.
Defeat a Brute
Defeat a Reptile.
Clear a Campaign scenario on Nightmare Difficulty.
Clear a Campaign scenario on Biohazard Difficulty or Higher.
Clear a Campaign scenario on Normal Difficulty or Higher.
Clear a Campaign Scenario on Easy Difficulty or Higher.
Defeat a Zombie.