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