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