Complete the first section of World 1.
Complete all of World 1.
Complete the first section of World 2.
Complete all of World 2.
Complete the first section of World 3.
Complete all of World 3.
Complete the game.
Collect your first Echo.
Rewind for the first time.
Fall to your death.
Make your first sacrifice at an Altar.
Create 4 Echos at the same time.
Create 8 Echos at the same time.