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