Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Activate your senses	Open the door of your senses.
Lethe	Reach the end of the path without the fragments.
Mnemosyne	Reach the end of the path with the fragments.
Open your mind	Open the door of your mind.
Path to Mnemosyne	Open the way to Mnemosyne.
Rebuild your memories 1	Unlock the first flashback.
Rebuild your memories 2	Unlock the second flashback.
Rebuild your memories 3	Unlock the third flashback.
Rebuild your memories 4	Unlock the fourth flashback.
Rebuild your memories 5	Unlock the fifth flashback.
Rebuild your memories 6	Unlock the sixth flashback.
What are these fragments?	Find the first hidden fragment.