Red Faction Guerilla Query.

So I have recently been playing red faction and I was just wondering whether or not you have to do all of the guerilla actions right away before you liberate the area or can you just nail them all after your liberated a mars?

You can "nail" them afterwards. You have to do some to be able to liberate an area but not many.

I feel like liberating a mars right now, from the fridge.

I think you can go back and do them.

When you finish the game, you can always go back and play them.

All 104 of them to get the achievement?