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