Here is the full list of all 36 Tony Hawk's Pro Skater 1 + 2 achievements.
Get hit by a vehicle on every map that features them.
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.
Land a 50,000+ point combo.
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.
Complete a match in multiplayer.
Earn a Medal on any competition park in Tours.
Unlock School II in THPS2 Classic.
Place 500 objects in CAP.
Create a skater using the CAS system.
Create a new park and upload it.
Break 20 Panes of Glass.
Unlock School in THPS1 Classic.
Unlock Roswell in THPS1 Classic.
Find every alien plushie.
Complete every goal in THPS1 Classic and gain all gold medals.
Earn any 4 Medals on competition parks in Tours.
Unlock Bullring in THPS2 Classic.
Complete every goal in THPS2 Classic and gain all gold medals.
Spend $10,000 in the Skate Shop.
Find all Stat points for any Pro Skater.
Unlock Officer Dick.
Earn the "Rookie " Challenge Collection.
Earn the "Veteran" Challenge Collection.
Earn the "Legend" Challenge Collection.
Complete all "Hard" Get-Theres.
Reach Career level 100.
Paint 100 surfaces in Graffiti across all playtime.
Give 50 Letters in Horse.
Complete all Gap collections.
Earn 5,000,000 points in Trick Attack across all playtime.
Earn 2,000,000 points in Combo Mambo across all playtime.
Achieve a judge score of 99.9 on a competition run.