- Finish all storyline missions (Home Sweet Home to The Sicilian Gambit).
- Complete all side-missions.
- Finish all races in first place
- Avenging Angels (15 levels in all three islands)
- Slash TV (twice)
- Car-azy Car Give Away (16 vehicles)
- Complete all vehicle odd jobs
- Collect all 100 Hidden Packages.
- Complete all 20 rampages.
- Complete all 26 Unique Stunt Jumps.
Once 100% is achieved in Liberty City Stories, the following rewards are given:
Bugs & Glitches
- It is possible to achieve 100% without completing all of the required tasks, the Paramedic side-mission can be left out and the goal can still be reached. Confirmed on PSP version.
- It is possible to achieve 100% Completion in Liberty City Stories under 24 hours.