Required vaccinations for adult applicants up to 59 years old -- Td/Tdap, MMR, Varicella, Hepatitis B, Flu (seasonal), COVID. Details here -- https://www.cdc.gov/immigrantrefugeehealth/panel-physicians/vaccinations.html#tbl1
If you've had chickenpox before, the clinic may take your word for it and not require Varicella vaccine. Full series of shots for COVID will be required prior to the medical, but boosters not required for immigration purposes.