Here is the full list of all 50 Def Jam: Rapstar achievements worth 1,000 gamerscore.
Perform 30 Battle or Duet performances in Party mode
Perform a Battle where you score 50,000 points more than your opponent
Complete all Multiplier Challenges
Complete all Career Mode Challenges
Upload an "Off The Chain" performance to the Community
Save a video with a visual effect
Upload a video to the Community
Save your first Freestyle performance
Unlock all locked content in Career mode
Earn the DEF JAM RAPSTAR Seal on a song
Complete all Timing Challenges
Complete all High Score Challenges
Complete a Duet earning an "Off The Chain" rating with both players on HARD difficulty
Complete all Endurance Challenges
Complete all Platinum Power Challenges
Perform a Battle where both players hit 25 rap targets in a row, at the same time
Perform a Duet where you score 50,000 points more than your friend
Accumulate 10,000,000 total points across all game modes
Get a "DOPE" lyric rating on every phrase in a song
Complete Stage 5
Launch a playlist in Party mode
Complete Stage 4
Activate Platinum Power 4 times in one song
Complete Stage 3
Get at least "On Point" on 5 different songs released before 1990
Get at least "On Point" on 5 different songs that mention a city by name
Get at least "On Point" on one song from Lil Wayne and one from Kanye West
Complete Stage 2
Rate a video on the Community
Unlock a song for the first time
Use an audio effect on any song in any game mode
Get "Off The Chain" on the Solo version of Gold Digger
Complete your first Challenge in Career mode
Complete Stage 1
Earn 5 microphones on any song in Career mode
Accumulate 305 microphones in Career mode
Watch 50 videos on the Community
Save 15 recordings to My Videos
Save 5 Freestyle videos
Finish a playlist containing 10 or more songs
Play 300 performances across all game modes
Upload 10 videos to the Community
Get at least "On Point" on 50 performances on HARD difficulty
Get 90% or above on pitch, timing, and lyrics while playing any song on HARD difficulty
Get at least "On Point" on a Solo on EXPERT difficulty with the original vocals turned off
Get a combined 2,000 views for all your uploaded videos
Get an average rating of 4 stars on any video with over 200 ratings
Win a Battle by less than 1,000 points
Get "Off The Chain" rating on all songs in a playlist containing 5 or more songs
Win all songs in a Battle playlist containing 5 or more songs