Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Ready To Roll (15 points): Complete the Training Test challenge in Street Training.
Don't Be Nervous (100 points): Unlock Tokyo in Casual.
Game Show Awaits (100 points): Unlock Tokyo in Confident.
It's Show Time (110 points): Unlock Tokyo in Hardcore.
One Trick Pony (15 points): Venice Beach, Trick Session: Score 10,000 Points in one Combo.
Grounded (30 points): LA River, Speed Session: Complete in under 1:30 without jumping.
Manual Mover (15 points): Lower Wacker Drive, Speed Session: Complete in under 1:00 with 200 ft of Manuals.
Monumental Task (30 points): Loop Plaza, Challenge Session: Activate Signature Moment during Challenge #3.
Speedster (30 points): Central Park, Speed Session: Collect 60 seconds worth of Time Bubbles.
Successful Matador (90 points): Barcelona, Challenge Session: Complete all Challenges without bailing.
Highlight Reel (30 points): Toledo, Trick Session: Score 20,000 Total Points in the Camera Spots.
Terminal Velocity (30 points): Frankfurt Terminal, Speed Session: Complete in under 1'45 without collecting any time bubbles.
Handy Man (30 points): Venice Half-Pipe: Score 10,000 points worth of grabs.
Quick Style (15 points): Boom Boom Huck Jam: Fire off the Signature Moment within 20 seconds of session start.
Heavy Lifting (15 points): Central Park Half-Pipe: Perform 10 Inverts.
Certified Chiropractor (15 points): Barcelona Half-Pipe: Perform 5 Spine Transfers.
Stalls with Style (15 points): Quiksilver 80s Vert: Fire off the Signature Moment using only Stalls.
Channel Surfing (15 points): Quiksilver 80s Vert: Channel the Gap 5 Times in one session.
Vert Master (30 points): Boom X2 Vertical U-Ramp Go: Complete level without bailing.
All Four One (15 points): Vans Downtown Showdown: Complete level successfully.
In the Bank (15 points): Back to the Banks: Complete level successfully.
Spelling Bee (90 points): Party Mode, éS Game of SKATE: Over 15 letters given out in one game.
Stride's Long Lasting Manual (30 points): Do one continuous Manual for 400 feet.
T-Mobile Sidekick Grab 5 (15 points): Half-Pipe: Do 5 different Grab Tricks in one session.

Additionally, there are two secret achievements:

Secret achievement (90 points): Unknown.
Secret achievement (15 points): Unknown.