Here is the full list of all 42 Victorious: Time to Shine achievements worth 1,000 gamerscore.
Created your character
Changed clothes for the first time
Selected the male character
Finished "I Want You Back"
Completed all Music Video Performances
Fully evolved Karaoke Doki
Completed all Performances with all Gold Stars
Completed all Dancing Performances with all Gold Stars
Completed all Dancing Performances
Collected all wardrobe items
Collected all the shoes
Collected all the upper body outfits
Fully evolved the Asphalt Café
Collected all the head items
Collected all the leg outfits
Fully evolved the Blackbox Theater
Fully evolved the carnival
Completed all Singing Performances with all Gold Stars
Completed all Singing Performances
Completed all Music Performances with all Gold Stars
Completed all Music Performances
Completed all Acting Performances with all Gold Stars
Completed all Acting Performances
Finished a Music Video Performance and triggered all cues
Fully evolved the Hollywood Arts locker hall
Scored a Gold Star in any Dance Performance without using the Helper Wheel
Fully evolved Maestro's Restaurant
Completed "You're the Reason" – Music Video
Played a game of Multiplayer Co-op Dance
Played a game of Multiplayer Competitive Dance
Played a game of Multiplayer Co-op Music
Played a game of Multiplayer Competitive Acting
Played a game of Multiplayer Co-op Acting
Played a game of Multiplayer Competitive Music
Fully evolved Sikowitz's classroom
Completed "You're the Reason" – Dance
Completed "You're the Reason" – Singing
Completed "You're the Reason" – Music
Completed an Acting Performance without missing a pose
Completed any Performance with 1,000,000 points
Completed "You're the Reason" – Acting
A cast member showed you their video of you!