Here is the full list of all 25 Stoked achievements worth 1,000 gamerscore.
Take 60 single photographs / all-in-ones and 20 environmental photographs
Score 500,000 points in a single run
Take 25 photographs of other riders on Xbox LIVE
Take 10 photographs of other riders on Xbox LIVE
Take the lead in an Event on Xbox LIVE
"Own" a Brand Battleground and help your sponsor subsequently seize control of the mountain
You “Owned” a Brand Battleground, stealing ownership from another rider on Xbox LIVE
Capture 10 photographs of nature
You found the crashed UFO and signed the guest book in Alaska
Beat Wolle, Annie, Travis, Tadashi, Nicolas and win 2 of the Events
You found the Peace Bell and signed the guestbook on Mt. Fuji
You found the Summit Cross and signed the guestbook on Mt. Shuksan
You found the Summit Cross and signed the guestbook on Diablerets
You found the Summit Cross and signed the guestbook on Almirante Nieto
Earn a pilot license for each mountain
Win all 5 Events and hit a fame ranking of 1800
Win all 5 Events and hit a fame ranking of 1400
Win Air Party on Mt. Fuji
Win Shred Fest on Mt. Shuksan
Win Highway to Hell in Alaska
Win Elements of Style on Diablerets
Win Wängle Tängle on Almirante Nieto
Hit a fame ranking of 186
Earn a sponsorship
You completed all of Wolle Nyvelt’s tutorials