100% Completion

In a Grand Theft Auto game, attaining 100% completion involves numerous tasks, though there are usually some things that are not required for 100% completion.

Below are explanations of what is required in each game to achieve 100% completion:

GTA III
Complete all story, payphone, and side missions. Complete 100 Taxi fares. Put 20 fires out on each island. Kill 20 criminals on each island. Complete Level 12 of Paramedic. Deliver all the cars to the Portland Import/Export Garage. Deliver all the cars to the Shoreside Vale Import/Export Garage. Deliver all emergency vehicles to the Portland Emergency Vehicle Crane. Deliver 10 Securicars to the Portland Securicar Garage. Complete all 20 rampages. Complete all 20 Unique Jumps. Collect 100 Hidden Packages.

GTA Vice City
The way to reach 100% in Vice City is to do the following thing


 * Finish all missions
 * Collect all 100 hidden packages
 * Finish all side missions(Taxi,Police,Ambulance,etc)
 * Get a high score at the shooting range
 * Win all Sunshine Autos 6 raceing missions.
 * Finish all 3 car missions at Hyman Memorial Stadium
 * Finish all 3 Top Fun missions.
 * Complete the 4 seaplane missions.
 * Do the dirt track missions.
 * Purchase all 8 safehouses
 * Get all 50 Uniqe Stunt jump

GTA IV
Main Article: 100% Completion in GTA IV
 * Complete the main story missions
 * Complete all 10 drug deliveries for Jacob Hughes
 * Win all 9 races for Brucie Kibbutz at least once
 * Exotic Exports for Brucie
 * Complete all 9 Assassination missions
 * Complete all 30 car thefts for Stevie
 * Brucie - Unlock special ability
 * Jacob - Unlock special ability
 * Packie - Unlock special ability
 * Brucie - Do each available activity once
 * Jacob - Do each available activity once
 * Packie - Do each available activity once
 * Beat a computer or friend at Pool
 * Beat a computer or friend at Darts
 * Beat a computer or friend in a full game of Bowling
 * Get the high score in the QUB3D arcade game
 * Do all random character missions (excluding Jeff, Ivan, Clarence, and Cherise)
 * Complete all the Most Wanted missions via police computer
 * do 20 vigilante missions via police computer using the "Recent Crimes" option
 * Kill all 200 Pigeons
 * Complete all 50 Unique Stunt Jumps