- Day Zero
Complete the first level of the Outbreak! (DLC) Level Pack
- 10 Days Later
Complete 10 levels of the Outbreak! (DLC) Level Pack
- 25 Days Later
Complete 25 levels of the Outbreak! (DLC) Level Pack
- Flatten the Curve
Defeat 500 Infected or Infectious Blobbs across all games.
- Containment Protocol
Complete 50 levels of the Outbreak! (DLC) Level Pack
- Patient Zero
Successfully track down Patient Zero in the Outbreak! (DLC) Level pack
- That Wasn't Meant to Happen!
Test Parasol's Cure in level 25 of the Outbreak! (DLC) Level Pack
- Kil it with Fire!
Defeat the final boss of the Destroy path of the Outbreak! (DLC) Level Pack
- Cured to Death
Defeat the final boss of the Cure path of the Outbreak! (DLC) Level Pack
- Purple Mist
Detonate a Vaccine Blobb for the first time
- Firestorm!
Use a Firestorm Strike during a Destroy path playthrough of the Outbreak! (DLC) Level Pack!
- Flash Freeze
Use the Cryolator for the first time during a Cure path playthrough of the Outbreak! (DLC) Level Pack!
- Choose a Path?
Choose between the "Destroy" or "Cure" paths during a playthrough of the Outbreak! (DLC) Level Pack!
- Bloody Mess
Defeat a Zombie Blobb in the Outbreak! (DLC) Level Pack
- Vaccinated
Cure a total of 100 Infected Blobbs across all games.
- Last Resort
End the epidemic by detonating a Nuke Blobb in the Outbreak! (DLC) Level Pack
- Miracle Cure
End the epidemic by perfecting the Cure in the Outbreak! (DLC) Level Pack
- Why Not Both!?
Complete both branches of the story in the Outbreak! (DLC) Level Pack
- Outbreak! Completionist
Unlock every achievement in the Outbreak! (DLC) Level Pack!