From the FAQ pinned at the top of the page it lists these vaccines that are required.
https://www.visajourney.com/forums/topic/734707-cr1ir1-montreal-faq/
What vaccines do I need?
1. Tetanus-Diphtheria (Td/Tdap) (Must have had done in last 10 years)
2. MMR (Measles, Mumps, Rubella)
3. Varicella (Chicken Pox) (If had Chicken Pox before not needed)
4. Flu Shot (Nov-March only, though Dr. Cheema in Surrey notes that it is needed from October-February)*
*If your medical is in March but your interview is in April, you will still be required to get a flu shot.
This is a bit outdated and needs to be adjusted as now they want Hep A and B to be at least started and Covid Vaccine needs to be completed.