Just cause 2 guide
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You can also call in a black market vehicle to use instead of the default one the game gives you, but I suggest only calling in vehicles if your default vehicle gets destroyed in an area where you can't hijack someone else's. Each challenge that involves a vehicle will provide you with a red one, so look out for it when you start each challenge.
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You'll want to finish at least 50 of them, but finishing more of these will raise your percentage faster than finishing locations will, so it'd be in your best interest to tackle as many challenges as you can that you think you can handle. There are also challenges that unlock just like faction missions, but are simply races in land, air, and sea vehicles, as well as a few grappling and parachute races tossed in to create a grand total of 75 challenges overall. For every faction and story mission, always take the vehicle they give you to start the mission off, because doing so will knock a bunch of vehicles off your list. The only other place to find it is during the Ular Boys mission Taking Care of the Dishes, unless you want to raise your heat to max level in the desert and wait for one to arrive. Make sure you also hijack the other two cars that Jade Tan isn't in for the fourth story mission these two are MV Commands and are extremely hard to find otherwise. All that you'd ever need to know about these missions can be found on their respective page in the walkthrough. Just make sure you're using inventory weapons.Ignoring these as you climb to 75% would be a bad move, because you wouldn't want to be completing more locations than you have to. You can also just find a small group of soldiers, blow them up, hide until the heat goes away, and repeat until you hit 50. At the end of the first mission, enemies will always spawn and come after you, so just stay safe and shoot until the achievement pops. You could also start up a new save file and run through the mission on the easiest difficulty, which will net you a bunch of kills. You could also go about getting this achievement in the Ular Boys mission mentioned for the Killing Frenzy achievement bring a rocket launcher and kill everyone without losing too much health, then get the last remaining kills elsewhere. You cannot use any weapons like the gatling guns or vehicles, as the kills have to be inventory weapons. You can tell whether the chain is still going by looking at the top left, which will notify you of your streak after every five kills. When it turns red and a heartbeat sound comes up, you've lost too much health and the combo has stopped. You'll need a combo of 50 kills without losing too much health unlike the achievement's description, you'll be fine as long as your screen doesn't turn red. The third is given for getting 750 overall kills, which you'll easily get when playing the game and going for the rest of the achievements down this list. Headshots and melee kills are pretty straightforward just aim for the head and melee enemies up close 50 times each for these first two achievements. The first few achievements won't require you to use tethering to get kills in special ways. You should focus on these achievements on your completion run rather than the Hardcore run to minimize frustration, but getting some of the easier ones out of the way while you're doing your first run wouldn't hurt. For most of these achievements, there will be an in-game counter that occasionally pops up in the upper left corner every once in a while when you perform that action. There are a lot based on killing enemies in a certain fashion, and others based on your driving and flying prowess. As with almost every game out there, there are going to be some miscellaneous tasks you probably won't get done unless by accident in order to get all of the achievements.