Here is the full list of all 11 Simultaneous Control achievements.
World 1 has been completed!
World 2 has been completed!
World 3 has been completed!
World 4 has been completed!
World 5 has been completed!
World 6 has been completed!
World 7 has been completed!
World 8 has been completed!
World 9 has been completed!
World 10 has been completed!
Finish the game with two players.