Here is the full list of all 15 Tony Hawk’s Pro Skater HD achievements.
Collect all pellets in one combo in Hawkman in The Hangar
Hold a combo for 30 seconds after the time is up in Marseille
Reach the end of the Mall 3 times in a single Big Head Survival run
Get 500,000 points in one run in Venice Beach
Complete the 100 Ski Jump gap in Downhill Jam
Complete all Projectives with one character
Unlock Officer Dick
Score 200,000 points without performing a single manual in one run in Warehouse
Perform 15 manuals in one combo in School II with Rodney Mullen
Unlock Marseille
Unlock Downhill Jam
Unlock Venice Beach
Unlock Mall
Unlock The Hangar
Unlock School II