one of the lifelong memories many of us share are the moment we obtain a drivers license.

Answer 1

Yep. You're right.

Answer 2

One of the lifelong memories many of us share is the moment we obtain a driver's license.

I don't know if this is what you want, but you need to start a sentence with a capital, make the verb match the number of the subject ("One") and indicate a possessive ("driver's").