Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Everything Is Illuminated	Collect all fragments of story.
God of Light	Collect 100 sparks.
Impenetrable Darkness	Die, getting swallowed by total darkness.
Light of Bonfire	Complete Chapter 2.
Light of Candle	Complete Chapter 1.
Lights of Fireworks	Complete Chapter 3.
Master of Jumping	Jump as far as possible.
No Way Out	Get caught by a mimic.
Portal Jumper	Use portals 50 times.
The End?...	Complete the game.