Here is the full list of all 22 Healing Spree achievements.
Finished Chapter 1 with 3 hearts
Finished Chapter 2 with 3 hearts
Finished Chapter 3 with 3 hearts
Finished Chapter 4 with 3 hearts
Finished Chapter 5 with 3 hearts
Finished Chapter 6 with 3 hearts
Fire any Gun
Cure any Patient
Get yourself burnt
Put any patient in CoffinDance
Suicide in Lava
Kill any friendly player 100 times
Collect 100 Shit in toilet
Flush away 100 Shit in toilet
Wash your hands 100 times
Cure 200 Patients
Throw 300 items
Use the Disinfectant Spray 1000 times
Use the Frame Thrower to burn 100 Patient
Use wheelchair to transfer any patient 100 times
Get killed by Traffic 100 times
Cure 50 Secret patients