Here is the full list of all 36 Tony Hawk's Pro Skater 1 + 2 achievements.
Reach Career level 100.
Give 50 Letters in Horse.
Complete all "Hard" Get-Theres.
Earn the "Legend" Challenge Collection.
Find all Stat points for any Pro Skater.
Earn the "Veteran" Challenge Collection.
Complete all Gap collections.
Earn 5,000,000 points in Trick Attack across all playtime.
Unlock Officer Dick.
Earn 2,000,000 points in Combo Mambo across all playtime.
Find every alien plushie.
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.
Achieve a judge score of 99.9 on a competition run.
Spend $10,000 in the Skate Shop.
Earn the "Rookie " Challenge Collection.
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.
Create a new park and upload it.
Place 500 objects in CAP.
Earn a Medal on any competition park in Tours.
Break 20 Panes of Glass.
Bail a 100,000+ point combo.
Land a 50,000+ point combo.
Reach Career level 10.
Paint 100 surfaces in Graffiti across all playtime.
Complete a match in multiplayer.
Unlock School in THPS1 Classic.
Create a skater using the CAS system.