Full list of all 71 LEGO Worlds achievements worth 1,345 gamerscore. It takes around 50-60 hours to unlock all of the achievements in the base game on Xbox One.
The base game contains 61 achievements worth 1,000 Gamerscore, and there are 2 DLC packs containing 10 achievements worth 345 Gamerscore.
Found all the Biomes
Collected all the brick elements
Played the trumpet to an Elephant
Played bagpipes to a brown bull
Collected 100 Gold Bricks
Collected 80 Gold Bricks
Rode a Shark on land
Dived continually for 3+ minutes
Found and walked around a Town
Had 5 squirrels following you around at the same time
Collected 60,000+ studs in a single streak (no more than 2 seconds between each stud collected)
Found a Dungeon
Took a picture of a posing character
Collected 65 Gold Bricks
Collected 50 Gold Bricks
Collected 40 Gold Bricks
Collected 30 Gold Bricks
Collected 25 Gold Bricks
Collected 20 Gold Bricks
Chased down and rode a Sheep
Found an item in a chest
Collected 15 Gold Bricks
Chased down and rode a Pig
Had two tamed pets following at the same time
Defeated 7 enemies in a streak (with a maximum 12 second gap in between)
Completed 15 seconds of consecutive climbing, jumping or back-flipping
Bought something from the night Trader
Caught a Troublemaker
Completed the Candy Construction Capers World
Collected 10 Gold Bricks
Completed the Prehistoric Peril World
Completed the Pirate Playground World
Collected 3 Gold Bricks
Started your Adventure
Use the terraforming abilities of all capable vehicles
Get 5 seconds of continuous vehicle air time (not including off the edge of the world)
Accumulate 10+ seconds of consecutive zip time with the grapple gun in one grapple session
Ride 4 different creatures within 60 seconds
Skydive uninterrupted from the highest point possible to the lowest point possible!
Splat a seagull with the paint-ball gun while it's mid-flight
Play an instrument next to another player, who's playing a different instrument
Blow up another player with a ridden Dragon fire ball
Find the Legendary 1x1 Brick
Find the Legendary 1x2 Brick
Find the Legendary 2x2 Brick
Find the Legendary 2x3 Brick
Find the Legendary 2x4 Brick
Find the Legendary 1x2 Slope Brick
Find the Legendary 2x2 Slope Brick
Find the Legendary 1x3 Slope Brick
Find the Legendary 2x3 Slope Brick
Find the Legendary 1x4 Slope Brick
Find the Legendary 2x4 Slope Brick
Find the Legendary 1x2x3 Slope Brick
Find the Legendary 2x2x3 Slope Brick
Find the Legendary 2x2 Corner Brick
Find the Legendary 3x3 Corner Brick
Bounce on Lava 7 times consecutively
Play all the musical note bricks within 10 seconds
Collect a billion studs
Ride a Badger
Driving the Space Buggy, launch it into the air for 3 seconds
Defeat 8 Large Space Spiders within 40 seconds. Watch out for pincer attacks!
Play some lunar tunes on the moon with another player whilst using a different musical instrument
Take Intergalactic Girl to the Classic Space Biome (Moonwalking optional!)
Shoot 10 rockets from the mobile Rocket Launcher
Create a single custom character, using a part from each of the new monster characters
Stake a claim to Monster Town by playing as the classic Vampire character in the Monsters pack
Play a guitar solo in the Monster Biome stage area in front of the crowd
Use the paintball gun to splatter paint on all the new monster characters
Collect Vampire & Lord Vampyre's Bride, then place them together in the Monsters castle