Reaching 100% in the "Game progress" statistic in GTA IV means finishing the story and a set list of side content. The game gives the following shares:
- Story missions: 60% (86 percentage-giving missions; either ending counts).
- Side jobs: 10% (Jacob's drug deliveries, Brucie's Exotic Exports and street races, Stevie's car thefts, the Fixer's assassinations).
- Police computer: 5% (30 Most Wanted, 20 Recent Crimes).
- Friends: 10% (every activity and the special ability of Little Jacob, Brucie and Packie).
- Random characters: 5% (10 characters).
- Activities: 5% (pool, darts, a full game of bowling, the QUB3D high score).
- 50 unique stunt jumps and 200 flying rats: 2.5% each.
Girlfriends, Roman, Dwayne, helitours, bridges, Liberty City Minute and the like are not required.
Reward: a "100% Game Completion" message, unlimited ammo for any weapon you buy, and the Key To The City achievement/trophy.