Do I need gold medals on all missions to get 100%?

Question

I'm trying to get the Career Criminal achievement for Grand Theft Auto 5 where you must get 100% game completion.

As part of this you must complete all story missions:

Story Missions(69)- All Story Missions, including Lester's Assassination Missions(available only to Franklin)

Do I need to get a Gold Medal in all missions, or is completing them enough?

Answer 1

You do not need Gold Medals.

Here is a 100% completion checklist from IGN.