I'm at 99.86 % right now. I just finished "The Wheel Deal" achievement thinking it would bring me up to 100% but it didn't even make a decimal difference. So I don't think that achievement affects your percentage complete, just pointing that out.
Also, welcome to gamefaqs Dante, I understand you are new =)
I had a problem finding the pirate to get my final slither of percentage. I knew where to find the pirate but he simply was not there. I also know I am not the only person who had this problem.
If you don't know :*SPOILERS*
He is on the big island very south of the map. Map reference H5.
If for some reason he does not appear for you what I suggest (what worked for me and at least one other person anyway) was to go back to the beach house save point, save the game, switch off the 360 and reload the game. Then go straight to the location and the pirate should hopefully be there
I MUST KNOW I have spent 6 in-game days searching the whole town day and night for errands, and I have had no luck.
The incognito and cowboy hat errands don't seem familiar, what are their locations? Are there any other abnormal and hard-to-reach errands that I should know of? I need this achievement, I have to return this game soon... =[
I did every achievement except the 100%, obviously... I have gotten 40/40 trophies, drank 500 sodas, rode all rides, played all games(set arcade records toos) bought everything but the scooter in the carnival. What else do you need to know?