Here is the full list of all 35 How to Train Your Dragon 2 achievements worth 1,000 gamerscore.
Complete all Tournament and Training events with Gold, complete every challenge and achievement.
Fly as each Dragon.
Unlock the Hidden Trait for Toothless
Unlock the Hidden Trait for Stormfly
Unlock the Hidden Trait for Meatlug
Unlock the Hidden Trait for Hookfang
Unlock the Hidden Trait for Barf & Belch
Rest on a Scenic Perch for 5 minutes.
Complete the secret Dragon Sprint in the clouds!
Complete the secret Dragon Sprint in less than 1 minute and 30 seconds.
Locate and land all of the scenic perches.
Get a perfect score on the Blazing Shot training event.
Complete all Training Events
Complete all Tournament Events
Deflect 2 fireballs in a single spin.
Viking Blitz 4 Dragon Riders within 30 seconds.
Achieve Gold on all training events.
Achieve Gold on all Tournament Events
Get Gold on every Training and Tournament events.
Fly each Dragon for at least 2 hours.
Hit 2 or more targets with a single shot using Meatlug.
Hit a target from over 200 meters away using Stormfly.
Hit 3 Dragon Riders with a single Barf & Belch Fire Boom.
Fire on your opponent(s) 10 times without missing once during a race.
Custom Racing Paint
All Dragon Racing Paints unlocked
Fly with each Dragon's Racing Paint.
Shoot a falling Dragon Rider with a fireball.
Win a tournament as Hiccup.
Win a tournament as Astrid.
Win a tournament as Fishlegs
Win a tournament as Ruffnut & Tuffnut
Win a tournament as Snotlout
Search the caves and locate Stoick.
Race Valka and win.