Complete 10 sponsor challenges.

Win an event without restarting a stage or resetting the truck.

Improve the truck's performance with upgrades.

Collect all trophies

Upgrade and then break one of every melee weapon

Use bricks or bottles to lure an infected into attacking a human

Win the water gun fight

Play the Jak X game in Left Behind

Win the brick throwing contest

Collect all comics

Break into every locked door using shivs

Find all training manuals

Pet Buckley the dog