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