Here is the full list of all 37 Just Dance 2020 achievements worth 1,000 gamerscore.
Dance to 10 different songs with Co-op mode activated
Reach Level 100
Score Superstar with Co-op mode activated
Complete one Challenge or more per day for 7 days
Score Megastar on all songs (no Kids or Alternate Version)
Complete your first song
Score Superstar on all songs (no Kids or Alternate Version)
Unlock 60 Stickers
Win a Team Battle in World Dance Floor
Score Superstar or more on each song in All Stars mode
Dance to the final song in All Stars mode
Score at least 3 stars on each song in All Stars mode
Get 3 stars on all songs (no Alternate, Kids or Just Dance Unlimited)
Unlock 20 Skins
Burn 302 kcal in Sweat mode in one session
Spend 10000 Mojos in the gift machine
Dance to a song with Coop Mode activated
Change the alias of one of your Dancer Cards 20 times
Dance to 5 songs in All Stars mode
Dance to the first song of the All Stars mode
Unlock 10 Skins
Participate in a Tournament in World Dance Floor
Beat a Boss in World Dance Floor
Complete 5 Daily Challenges
Spend 1000 Mojos in the gift machine
Unlock your first Sticker
Perform only Good or better on any song
Score Megastar on a song
Get 3 stars on 5 different songs
Unlock your first Skin
Reach Level 5
Perform all the Gold on a song
Get 20 Super or better in a row on any song
Get 10 Perfect in a row on any song
Get all the gift machine rewards
Score Superstar on a song
Unlock all the Stickers