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.
All achievements
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.
Die.
Defeat a Zombie.