Here is the full list of all 13 Outbreak: The Nightmare Chronicles achievements.
You died for a fourth time.
You died for a third time.
They finally... killed you again.
They finally killed you.
Consumed ten healing items.
Defeated 100 threats.
Defeated fifty threats.
Defeated twenty threats.
Solved ten puzzles.
Solved your first puzzle.
Survived a campaign chapter or the Battle Mode.
Consumed a healing item.
Defeated a threat.