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