Defeating Blacksmoke James
Attack Blacksmoke James with Square(2). When he attacks, block with R1. When he hides in the smoke, pick up a barrel on one side and on your way to the other look for bullets or bombs coming out of the smoke. This is where he will be. Then, throw the powder kegs at that location and pick up the one on the side you are going to. Repeat this until he is defeated.
Easy money
First, upgrade all available moves to make killing enemies easier. Then, kill as many enemies as possible. Repeat the level, then kill them again.
Heal two characters with one power-up
At any time when both Jack and Will or Elizabeth are injured, find a health chest. Open it with one person. Instead of moving that same character, switch and walk a bit off so that the other character moves with you. Have the person you are controlling move back to the chest and get the power-up. Switch back and both characters will be fully healed.
How to burn the middle mast of the Spanish Ship
This is actually too simple.When you burn up the 2 masts at the ends of the ship, go down and a cutscene will start.Then you will be in a fight with the dude who is the leader of the Spaniards.
I recommend you to use Will instead of Captain Jack Sparrow as the guy will mainly follow him. Hit the main guy once and he'll start following you. Take full advantage of the situation.Hit him by pressing X (quick attk) 3 times next to the pole.*Note* Make sure you hit the guy. He'll do his "Thousand spin strike". Move away as it causes a lot of damage. Do this around the pole.Repeat the process 5-6 times and Voila! The level is finished.....
How to defeat the Chaves
This, for me, was the hardest level by far. Fortunately, it is the last level so if you follow this guide, you'll have completed the game.
First of all, there's Alberto Chaves (The blue one). To defeat him, you need to press square twice and then roll out of the way (R1 + L). It is easy to lose life fighting him but if you do it right and wait for him to finnish his attack, you should be fine.
Next there's Benito Chaves (the red fat one). He was the easiest for me. Attack him as you did Alberto but rather than rolling out of the way, hold R1 to block him. You won't get hurt from him, only the gunmen which you can easily take out. Alberto will still be there so just try to avoid him. Try to single him out and attack him, it will be much easier than fighting both brothers at once. What I do is they both gang up on you, restart.
When you do enough damage, the final brother will come out (the green one). He is the hardest to defeat if you don't know how to because he's got a fire whip. Fighting him, it will be easier if you play as Jack Sparrow. Try to avoid guards and the other two brothers until you have beaten him. Use Jack's grog bombs and throw them at him until he dies. If you run out before he dies, go onto Will and use his hatchets. The Hatchets do less damage so it is advisable to start with Jack.
Once you have defeated him, go onto the others as explained before.
After you have beaten all of them, you will see a cut scene of the Black Pearl being blown to bits by cannons. If you tried the level before, you were probably running about the place trying to fund the cannon so you could stop them working but you can't. Ignore the guards (only fight them if you have to as it will waste time) and run like hell to the Black Pearl. Then use the cannons on The Black Pearl to kill guards shooting at you and destroy the wall. When you have done this, a cut-scene will follow on the Black Pearl (I think it's the Black Pearl) and you have completed the game!