Here is the full list of all 15 Disney Dreamlight Valley achievements worth 1,000 gamerscore.
Have 15 Best Friends
Unlock all Biomes
Take 50 pictures
Fully upgrade the player's House
Unlock all of Goofy's Stalls
Catch 1,800 fish
Cook 900 meals
Give 540 Gifts
Collect 1,800,000 Star Coins
Harvest 4,500 Vegetables
Mine 1,800 times
Remove 3,000 Night Thorns
Build 30 Houses for friends
Start 1,000 daily discussions
Complete 1,100 Dreamlight Duties