Here is the full list of all 50 Sonic & All-Stars Racing Transformed achievements worth 1,000 gamerscore.
Got 10 hits by firing weapons backwards in a single event
Did 10 Stunt Combos in a single event
Completed an event with 4 local friends
Finished a Battle Race without losing any lives
Unlocked every Character in the game
Completed the Dream Valley Ring Race and passed every Ring as NiGHTS or Reala
Visited every location in the game
Earned your Star License
Got a Podium Finish in every Grand Prix tournament
Got a Podium Finish in every Grand Prix tournament on Expert difficulty
Finished 1st in every Grand Prix tournament on Expert difficulty
Unlocked Mirror Grand Prix mode
Hit 1st, 2nd and 3rd place with a Swarm attack
Earned your S Class License
Did a Boost-Start in each vehicle mode
Got a Perfect Drift score on a Drift Challenge event
Finished 1st in a Grand Prix tournament
Finished 1st in a Grand Prix tournament at Expert difficulty
Completed a World Tour event on Expert difficulty
Unlocked Superstar Showdown in World Tour
Did a Reckless Boost
Earned your A Class License
Got a total of 20 hits with weapons in a Race
Triple-Stunted while transforming into a car or boat
Rolled Left, Rolled Right, Backflipped, Forward Flipped and landed as a car or boat
Beat 01:11.16 in Time Attack as Vyse in Rogue's Landing
Beat your first Staff Ghost in Time Attack
Finished 1st, 2nd, 3rd and 4th with local friends in a 10 player Race
Evaded or Blocked a homing-weapon 3 times in a Race
Did 5 overtakes in a single Drift
Absorbed a weapon with the Glove and fired it back at your attacker
Earned your B Class License
Scored 90% accuracy with aimed weapons in an event
Did a Level 3 Air-Drift
Froze an opponent with Ice from at least 100 meters away
Won a Matchmaking game
Manually selected a Random character for a Matchmaking game
Hit 2 opponents with a single Hot Rod Blast
Did a 10 second Drift as Sonic
Won an event with a Mod equipped
Collected 10 Stars in World Tour
Hit an opponent with a weapon while looking backwards
Levelled-up a character
Finished 0.5 seconds ahead of an opponent in a Race
Finished 1st in a Race without getting hit by weapons
Turned All-Star
Detonated the Hot Rod at the very last second
Earn your Triple-Star License
Beat all the Staff Ghosts in Time Attack
Collect every Star in World Tour