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