Full list of all 12 Outbreak: The Nightmare Chronicles achievements worth 1,000 gamerscore.
All achievements
Achievements they've won
Achievements they've not won
Defeat 200 threats.
Land 50 critical hits.
Solve 50 puzzles.
Defeat 100 threats.
Land 10 critical hits.
Heal yourself 10 times.
Solve 10 puzzles.
Defeat 20 threats.
Land a critical hit.
Heal yourself.
Defeat your first threat.
Solve a puzzle.