Here is the full list of all 12 Meow Lab achievements.
Start the first level
Achieve the level with the rotating block
Achieve the level with the block that moves horizontally
Achieve the level with the block that moves vertically
Achieve the level with the rotating block that moves horizontally
Achieve the level with the rotating block that moves vertically
Achieve the level with the rotating block that moves
Go through the first portal
Go through the second portal
Go through the third portal
Finish the game
Collect all Easter eggs