Here is the full list of all 50 The LEGO Movie 2 Videogame achievements worth 1,000 gamerscore.
Completed the Game to 100%
Built 20 buildings in Syspocalypstar
Collected all the Master Pieces in the Systarian Jungle
Collected all the Master Pieces in Harmony City
Collected all the Master Pieces in The Ceremony
Collected all the Master Pieces on Planet Sparkles
Completed the Planet Sparkles Level
Collected all the Master Pieces in Classic Bricksburg
Completed Classic Bricksburg
Collected all the Master Pieces in the Asteroid Field
Collected all the Master Pieces on Apocalypseburg
Collected all the Master Pieces on Planet Unikitty
Completed the Planet Unikitty
Collected all the Master Pieces in the Middle Zealand
Completed Middle Zealand
You Unlocked a Gold Character Variant
Collected all the Master Pieces in the Sorting Area
Collected all the Master Pieces in the Old West
Completed The Ceremony Level
Completed the Main Story
You Unlocked Sweet Mayhem
You Unlocked Batman
Completed the Sorting Area Level
Defeated the Sorting Area Boss
Collected 100 Characters in the game
You Unlocked Benny
Completed the Harmony City Level
Collected 100 Items in the game
You Unlocked MetalBeard
Played as a Minidoll for the First Time
Completed the Systarian Jungle Level
Defeated the Systarian Jungle Boss
You Unlocked Unikitty
Completed the Old West
Opened 50 Relics
Collected 1,000,000 Studs
Opened your first duplicate relic
Completed the Asteroid Field Level
You Unlocked Rex
You collected 1000 Brick Pickups
Completed the Syspocalypstar Sandbox Tutorial
Tried to place an object somewhere you can't, while on Syspocalypstar.
Bought Something in a Shop
Opened your First Relic
Completed the Apocalypseburg Level
Defeated the Boss on Apocalypseburg
Shot 50 stickers with the Sticker Gun
Did a build attack
Opened a Discovery Chest
You Unlocked Lucy