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