Complete the indicated task to unlock the achievement.

Achievement	How to unlock
A Walk in the Park	Complete the prologue.
Big Bang	(Secret)
Blackout	(Secret)
Dark Skies	Complete Chapter 5.
Death by Gravity	(Secret)
Double Wipe-out	(Secret)
Down the Helter-skelter	Complete Chapter 7.
Fly Away	(Secret)
Good Air	(Secret)
Into the Woods	Complete Chapter 1.
Inversion	(Secret)
Journey to the Centre	Complete Chapter 4.
Keepie Uppie King	(Secret)
Kentucky Derby	(Secret)
Portal Buddies	(Secret)
Puzzle Speedster	(Secret)
Raining Leaves	(Secret)
Rat Race	(Secret)
Reunited	Complete Samsara.
Reversal of Fortune	(Secret)
Ripple Effect	(Secret)
Rocking Horse	(Secret)
Shocker!	(Secret)
Split the Coconuts	(Secret)
Sprinkler	(Secret)
Squeak	(Secret)
Stomp	(Secret)
Stop the Abduction	(Secret)
Strangled	(Secret)
Stuck Between a Rock and a Hard Place	(Secret)
Survive the Ghost Train	Complete Chapter 8.
The Descent	Complete Chapter 3.
The End of Suburbia	Complete Chapter 6.
The Raccoons	(Secret)
Tree of life	Complete Chapter 2.
Upside Down	Complete a level inversed.