I started this game on experienced difficulty, beat the game and grabbed all the achievements along with it ending up at about 60 hours of game time and 80% complete. I lost interest in the game but the 40g achievement score for completing this game on hardcore mode made me run for a quick hardcore mode session.
if some of you are still in doubt whether to do this here are some stats
Game time to complete the story:
around 8 hours
Chaos needed in order to unlock 6th-7th mission ( They are tied, so when you finish mission 6, the 7th mission will automatically load ):
Percentage complete after 7th mission:
How I did it:
I started with grabbing some resource items in the small villages. Made sure the little chopper, the Rowllington or whatever, was upgraded to level 6, I did the same with the assault rifle. These are the only 2 you basically need. Then I did the stronghold missions, switching to faction missions in order to unlock more strongholds and agency missions. This goes pretty quick and I was done with the 4th agency mission at 3-4 hours of game time. Then all I did was take the little chopper and fly to all the big bases and oil rigs and shoot every chaos object I saw. Until I was at 435k so I could finish the game.dropK1CK ninJA
gave us some nice chaos numbers for completing certain places.
Oilrigs: 1,500 Chaos
Big Oilrigs: 3,000 Chaos
Skull Island ( in the shape of a horseshoe on the map, around the middle ): 18,000 Chaos
Strongholds: 7,500 Chaos
P.S. I did it in 8 hours but you can probably do it between 6-7 hours. While doing this run I still found myself messing around and wasting time...