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