Here is the full list of all 44 High School Musical 3: Senior Year Dance achievements worth 1,000 gamerscore.
Total game time of 8 hours
Complete all Secret Cues
Earn 100 million total points
Spend 1 hour in Hold Cues
100 note combo in Dance Duo
Double your teammate's Dance Accuracy in Dance Duo
Get an A+ on every song
Get an A on Every HSM3 Song
Get an A on Every HSM2 Song
Get an A on Every HSM1 Song
Play 50 times with any character
Unlock all Signatures
Reach 300 In-a-row
Graduate!
Unlock Senior Difficulty
Pass every song
Activate Super Star 100 times
Have 3 Blockers at one time in Dance-Off
Block your opponent in Dance-Off
Max out the performance meter after almost failing
Have a GPA above 3.3 after 50 songs
Get 100% dance accuracy
Get all quiz conclusions
Play 50 Quizzes
Complete all quizzes
Unlock all characters
Finish the song in the performance meter's warning zone
Pass a song using only 1 sector
Fail a Song
Hit 1000 Cues perfectly
Activate Super Star 3 times in one song
Hit 1000 Cues
Pass a song without hitting held notes
Never enter red zone in the performance meter
Complete a Secret Cue phrase
Get an A+ on a song
Hit above 50% of notes perfectly
Complete the tutorial
Create a female CAW character
Create a male CAW character
Reach 100 In-a-row
Reach 50 In-a-row
Unlock all clothing pieces
Spend 2 hours in Super Star Mode