Here is the full list of all 23 Urban Trial Playground achievements.
Complete all Levels with 5 star rating.
Perform 5,000 total Tricks.
Complete all Challenges.
Collect all Chips.
Complete "Late 2 Gate" with zero crashes and without hitting the brakes.
Unlock all Motorbikes.
Unlock all Levels.
Frontflip over the Hotdog in "Sup Dawg".
Score 500,000 points in one Combo.
Get x20 score multiplier.
Score 20,000 points by performing a single Stoppie.
Perform 1,000 Tricks playing as Riley.
Crash 100 times.
Score 500,000 points in one run on any Level.
Score 300,000 points in one Combo.
Get x15 score multiplier.
Score 250,000 points in one run on any Level.
Unlock Level 30.
Score 100,000 points in one Combo.
Perform 1,000 Tricks playing as Tommy.
Unlock Level 15.
Get x10 score multiplier.
Score 20,000 points by performing a single Wheelie.