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