The Classic Space Pack Add-on for LEGO Worlds has 5 achievements.
Play some lunar tunes on the moon with another player whilst using a different musical instrument
Driving the Space Buggy, launch it into the air for 3 seconds
Take Intergalactic Girl to the Classic Space Biome (Moonwalking optional!)
Shoot 10 rockets from the mobile Rocket Launcher
Defeat 8 Large Space Spiders within 40 seconds. Watch out for pincer attacks!