Spiderman says:

@sanchitjain974, It is strange that you neither possess any Account Number nor any Pass Book or ATM-Debit Card of the account you are maintaining. You have just mentioned that you have linked your Bank Account with Aadhar. Now, do you know the Name of the Bank and Branch where you opened the account? I presume that you have forgotten the name of the Bank and Branch also. In such case, though it is very difficult yet I can help you to proceed as under:
1. Visit official website of Aadhar Authority at https://uidai.gov.in/
2. In the 3rd column click on Check Aadhaar & Bank Account Linking Status which will take you to the webpage at https://resident.uidai.gov.in/bank-mapper
3. Enter your Aadhar Number and Security Code.
4. Press Send OTP.
5. You will get OTP on your Mobile and in case you have not provided the Mobile in Aadhar, you will not be able to proceed further. Visit some CSC or Samadhan Kender to get it done.
6. Now Enter the OTP and Press Login
7. The result will be displayed as under:
Aadhaar Number : xxxxxxxxxx51
Bank Linking Status : Active
Bank Linking Date : DD-MM-YYYY(the date when you linked Aadhar with Bank
Bank Name : BANK NAME

Now try to remember the Branch Name and call the Branch Officials to know the Account Number.

You can also visit any Common Service Centre with Name of the Bank and through Biometric Aadhar Based Authentication you can know the Balance in your account and your Account Number will get displayed through Aadhar Based Biometric Authentication.

If you are getting LPG subsidy in your Aadhar Linked account then you can log in to your LPG Provider and in case you have not made your profile yet you can register as a new user. You can see the Name of the Bank and Account Number to which subsidy is being credited.