Here is the full list of all 27 OlliOlli2: Welcome to Olliwood achievements.
Unlock Titan Sky
Achieve a total of 100 Perfect Launches
Unlock Carnival of the Dead
Unlock Gunmetal Creek
Get your first 1,000,000+ combo
Achieve a total of 100 Perfect Landings
Unlock Curse of the Aztec
Unlock Olliwood
Obtain all Trophies
100% Completion
Finish every level in RAD mode
Beat every challenge/Unlock RAD mode
Find the 10 members of the Roll7 dev team
Unlock every Spot
Compete in the Daily Grind 7 times
Perform one of every trick
Beat every Amateur challenge
Finish any Pro level with every landing, grind and launch perfect
Set a score on every Spot
Finish every Amateur career level
Achieve a total of 100 Perfect Revert-Manuals
Achieve a total of 100 Grind-Switches
Complete every level in Skatepark
Achieve a total of 50 Perfect Reverts
Achieve a total of 500 Perfect Manuals
Achieve a total of 1000 Perfect Grinds
Compete in the Daily Grind