100% Completion Breakdown

Story Missions [65%]
Each story mission is worth 2.7272727272727272727272727272727%.
There are 22 story missions to complete which give percentage.
The mission "Hit The Pipe" gives an additional 5% completion for some reason, giving a total of 7.7272727272727272727272727272727%.

Side Jobs [10%]

• Angus' Bike Theft Jobs
• Once you have completed all 10 of his bike theft missions, you will receive 5%.
• Call Angus and use the job option to begin these missions.

• Tom Stubbs' Dirty Laundry Jobs
• Once you have completed all 5 of the missions, you will receive 5%.
• Call Stubbs and use the job option to begin these missions.

Friend Activities [5%]

• Once you have completed all 7 activities (Air Hockey, Darts, Drinking, Eating, Pool, Show, Strip Club), you will receive 5%.
• You only have to do each of the activities once, regardless of which friend (Clay or Terry) you take with you.

Random Pedestrians [5%]
Once you have completed all missions for a random pedestrian, you will receive 2.5%.
There are 3 random pedestrian missions to complete (from 2 different pedestrians), giving a total of 5% available.
Some pedestrians have more than one mission. You will only be awarded the percentage after you have finished all of their missions.
The pedestrians you must meet and complete are:

• Malc (x2)
• Dave

Activities [5%]
Each Activity is worth 1.25%.
There are 4 activities to complete in total.
You must complete the following:

• Win a game of Arm Wrestling (against anyone)
• Win a game of Air Hockey (against anyone)
• Win a game of Pool (against anyone)
• Win a game of Darts (against anyone)

Side Objectives [10%]

• Bike Races
• Once you have won all 12 of the races, you will receive 3.333%.
• You'll find helmet icons on your map. Go to each of these and win the race.

• Seagulls
• Once you have killed all 50 seagulls, you will receive 3.333%.

• Gang Wars
• Once you have won at least 25 gang wars, you will receive 3.333%.