Here is the full list of all 38 OVERPASS™ achievements.
Own everything in Career mode
Finish an online race
Finish a split screen race
Finish a hot seat race
Install an upgrade of each type for all vehicles
Own all liveries in Career mode
Own all vehicles in Career mode
Change the livery of a vehicle in Career mode
Own all rider gear in Career mode
Unlock everything in Career mode
Unlock all vehicles in Career mode
Unlock all rider gear in Career mode
Repair your vehicles for a total cost of $20000
Win a duel
Win a Gold medal on all tracks in The Pit
Win a Gold medal on all tracks
Win a Gold medal on all tracks in Jungle Ridge
Win a Gold medal on all tracks in Northern Forest
Win a Gold medal on all tracks in Old Canyon
Win a Gold medal on all tracks in Adriatic Coast
Win a Gold medal on all tracks in Open Arena
Win the World Finals
Qualify for the World Finals
Spend time repairing a vehicle yourself
Earn the highest reputation title
Play a race in each venue
Install an upgrade of each type for a vehicle
Win your first hillclimb in Career mode
Buy your first vehicle in Career mode
Win 3 challenges in a row in Career mode
Earn your first reputation title
Install a vehicle upgrade
Win your first Challenge
Win your first obstacle course in Career mode
Win your first Gold medal on a track
Finish a race and sustain less than 10% damage
Finish an obstacle course without any penalties
Collect all other achievements