This is a definitive checklist to achieving 100% in Grand Theft Auto IV. I've personally confirmed all of these tasks. Feel free to reply if you think something is inaccurate. There are gameplay spoilers in this thread!

Good luck!

• Complete 90 story missions and reach the game's credits, irrelevant of choices made and ending received (60%).

• Win in a full game of bowling (1.25%).
  
• Win in a game of darts (1.25%).
  
• Win in a game of pool (1.25%).
  
• Beat the high score of 10950 in QUB3D (1.25%).

• Complete all 50 stunt jumps (2.5%). (see also: Unique Stunt Jumps Video Guide)
  
• Kill all 200 pigeons scattered around the city (2.5%).
  
• Find and steal all 30 cars requested by text message from Stevie (2%). (see also: Maps)

• Raise friendship with Little Jacob to 60% to unlock his special ability (1.66%).
  
• Raise friendship with Brucie to 70% to unlock his special ability (1.66%).
  
• Raise friendship with Packie to 75% unlock his special ability (1.66%).
  
• Go out with Little Jacob, carrying out every available option at least once (1.66%).
  • Darts
    
  • Drinking
    
  • Eating
    
  • Pool
    
  • Show
    
  • Strip Club
• Go out with Brucie, carrying out every available option at least once (1.66%).
  • Boating
    
  • Bowling
    
  • Drinking
    
  • Eating
    
  • Heli Ride
    
  • Show
    
  • Strip Club
• Go out with Packie, carrying out every available option at least once (1.66%).
  • Bowling
    
  • Darts
    
  • Drinking
    
  • Pool
    
  • Show
    
  • Strip Club

• Complete all tasks given by random characters met in the street (5%).
  • Badman
    
  • Brian (3 encounters)
    
  • Eddie (2 encounters)
    
  • Gracie
    
  • Ilyena
    
  • Hossan
    
  • Marnie (2 encounters)
    
  • Mel
    
  • Pathos (2 encounters)
    
  • Sara (2 encounters)
    
  • Note: You do not have to meet Cherise, Clarence, Ivan or Jeff. Their tasks do not contribute toward 100% completion.

• Kill all 9 assassination targets (2%).
  
• Set a time in all 9 street races given by Brucie by finishing in first place (2%).
  
• Steal all 10 "Exotic Export" cars requested by email from Brucie (2%).
  
• Complete all 10 deliveries for Little Jacob (2%).

• Complete 20 "Current Crimes" side missions (cumulative over all islands) (2.5%).
  
• Kill 30 criminals in in the "Most Wanted" side mission (10 per island) (2.5%). (see also: "Most Wanted" side mission tips)

Spoiler: Reward for reaching 100% in the "Game progress" statistic
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Ammunition cap lifted
You can purchase as much ammunition as you like from the gun stores scattered around Liberty City or from Little Jacob. Note you do still need to earn the cash to buy the ammunition with beforehand.

There does not appear to be any in game message or unique prize for achieving 100% game completion. All you unlock is the minor ability above. Achieving 100% does, however, gain you entry into the "100% Club" leaderboard at the Rockstar Games' Social Club. This is providing you have registered at the Social Club and linked your PlayStation Network ID to your profile.

Spoiler: Reward for killing all 200 Flying Rats
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"All diseased pigeons killed. LC is a cleaner place."
An Annihilator attack chopper now spawns on the helipad at the top of the very tall MeTV building on the corner of Kunzite Street and Denver-Exeter Avenue in Star Junction, Algonquin. This star shaped helipad is illuminated by purple lights in the evening. The building itself is easily identifiable at street level as it has a rotating MeTV advert on a faux vinyl player on its wall. It also has several movie posters and an open car park garage at its base. The easiest way to get to it is to steal a Maverick helicopter from the Helitours and fly toward the Comedy Club.

Spoiler: Reward for completing Stevie's car boosts
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South Bohan garage open
The South Bohan garage will now offer money for any vehicle you deliver. The better the condition, the more money you will earn.

Spoiler: Little Jacob's special ability (unlocked at 60% friendship)
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Guns
Little Jacob parks in a nearby alleyway and sells you discount priced guns from the trunk of his car.


Spoiler: Brucie's special ability (unlocked at 70% friendship)
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Chopper
Brucie lands his helicopter nearby and takes you to fixed destinations on the map.


Spoiler: Packie's special ability (unlocked at 75% friendship)
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Bomb
Packie brings you a bomb that you can place on a car and detonate with your mobile phone.

I wasn't sure about the Most Wanted list. I just killed all the ones I have access to, which are the ones on Algonquin, Broker, Dukes, and Bohan.

Oh and great list. I put this into the Topic Listings.

Why are they hard? Are they difficult to find or do you have to chase them down and steal them from fleeing drivers?

Stevie sends you a picture message that contains a photograph of a car. Alongside the photograph is a rough description of where the car will be. It's then up to you to find where that is and look out for clues in the image to hunt it down. The game notifies you once you enter the correct car. The cash you earn is relative to the condition it arrives in back at Stevie's garage.

Unfortunately it seems the only way to prompt Stevie to send you the next target is to let some time pass. You can get around this by saving the game.

Having said that, they're still fun!

I get the feeling that perhaps the key to doing these scavenger hunt missions is to start them the moment they become available. This way, you can get them at your leisure, between other activities. I think that you are having more trouble perhaps, because you already completed the game and are at the mercy of when you get the pictures.

That said, Xanctuary, why don't we leave this thread for your original post? You can start another one for this topic, which I will immediately list in the TL.

Good idea. I'll add a map detailing the random characters to this thread once I get around to finishing them up.

quote 100% Checklist

Reach the end credits of the storyline, irrelevant of choices made and ending received.

quote Xenctuary

Good idea. I'll add a map detailing the random characters to this thread once I get around to finishing them up.

_{Hey Xenc you think you could find a map with all Weapons and armor listed?}

I've added my best estimates for how much percentage each task nets you. Again, if you see anything wrong please point it out!

quote Braden

quote 100% Checklist

Reach the end credits of the storyline, irrelevant of choices made and ending received.

Does that mean that if the wrong choice is made, obtaining 100% will be *bleep*ed up?

Holy shit I misread the phrase, sorry.

quote Final Blade

_{Hey Xenc you think you could find a map with all Weapons and armor listed?}

quote Mnmfan

quote Final Blade

_{Hey Xenc you think you could find a map with all Weapons and armor listed?}

Spoiler: Maps

Highlight this box with your cursor to read the spoiler text.

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On the Internet in the game go to whattheydonotwantyoutoknow.com for all the maps you need.

When do the Assasination Missions open up?

_{Yes but its an eyesore for me looking at it due to my crappy TV.}

thanks for the list and map xenc

quote Xenctuary

Set a time in all 9 street races given by Brucie (2%).

quote Xenctuary

Kill 20 criminals in in the "Current Crimes" side mission (cumulative) (2.5%).