Here is the full list of all 36 Tony Hawk's Pro Skater 1 + 2 achievements.
Spend $10,000 in the Skate Shop.
Achieve a High Score of 1,000,000+ on any classic Park.
Unlock Officer Dick.
Earn the "Rookie " Challenge Collection.
Complete every goal in THPS2 Classic and gain all gold medals.
Unlock Bullring in THPS2 Classic.
Earn any 4 Medals on competition parks in Tours.
Unlock School II in THPS2 Classic.
Complete every goal in THPS1 Classic and gain all gold medals.
Achieve a judge score of 99.9 on a competition run.
Unlock Roswell in THPS1 Classic.
Bail a 100,000+ point combo.
Break 20 Panes of Glass.
Earn a Medal on any competition park in Tours.
Reach Career level 10.
Land a 50,000+ point combo.
Unlock School in THPS1 Classic.
Create a skater using the CAS system.
Find every alien plushie.
Get hit by the Bull in Bullring.
Complete a match in multiplayer.
Get hit by a vehicle on every map that features them.
Create a new park and upload it.
Find all Stat points for any Pro Skater.
Earn the "Veteran" Challenge Collection.
Earn the "Legend" Challenge Collection.
Complete all "Hard" Get-Theres.
Reach Career level 100.
Paint 100 surfaces in Graffiti across all playtime.
Give 50 Letters in Horse.
Land a 1,000,000+ point combo.
Earn a score of 10,000,000 in any park in a 2 minute session or single combo. Game Mods must be disabled.
Complete all Gap collections.
Place 500 objects in CAP.
Earn 5,000,000 points in Trick Attack across all playtime.
Earn 2,000,000 points in Combo Mambo across all playtime.