The two complete sets
For the completion route, gather all 50 Spaceship Parts and all 50 Letter Scraps, then finish the associated Franklin mission chains. Merely finding the final object can leave a follow-up to do. Track which items were collected in the actual save, not just which map markers were visited.
Some challenges need only part of the set
- Complete 25 of the 50 stunt jumps.
- Complete 25 of the 50 Under the Bridge flights.
- Complete 8 of the 15 Knife Flights.
Make a route you can audit
Work region by region and label uncertain pickups immediately. For flight challenges, make a manual save, choose a stable aircraft and practice without trying to combine every collectible category into one sortie. Nuclear Waste, Submarine Pieces and extra enhanced-edition collectibles are separate projects; do not assume every optional set advances the original 100% statistic. Compare your results with the in-game checklist before repeating a long route.