Didn't you ever herd of things called cheats?
But, if you want it 100% do the paramedic and police missions so you have stronger hart and armor.
Then find some strong car to enter so you can shoot from it and then find the crane in that base and near it there is a path where you need to go and kill more 50 solders!
Or to save you of troubles go to the airport find some plane and go with it.
I hope I helped!
That girlfriend thing is cool!
And a huge database of cellphones would be cool, you know!
A major corporations could pay so R* can put their cellphone in database.
Oh, you will, that happend to me when I've got my firs PC, I had 80 gigs and I tought that I will never fill them up but after a few weaks, I asked my father to buy a new Hard Disk, he said no of curse.