Here is the full list of all 20 MatchyGotchy achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Have your star fall asleep 10 times.
Take 300 selfies.
Let at least one star die.
Experience sugar rush 10 times.
Win the game! Get 100% explored on Xanadu.
Build a total of 1000 ships.
Level Doctor UFO.
Play games a total of 50 times.
Survive all stages: smol egg, tiny baby, awkward teen, rocket surgeon.
Level Speedy Sputnik.
Fill up hearts 100 times.
Eat 100 burgers.
Level Pirate Planet.
Heal your stars a total of 10 times.
Clean up a total of 10 times.
Level Guru Moon.
Level Matchy Star.
Level Spacey Galaxy.
Level Loony Lander.
Build 10 ships and unlock Xanadu.