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