Story related and cannot be missed. Just simply play the game.
There are 8 memories in DNA Sequence 5.
Memory 1 - Four to the Floor
Memory 2 - A Blade with Bite
Memory 3 - Evasive Maneuvers
Memory 4 - Town Crier
Memory 5 - Behind Closed Doors
Memory 6 - Come Out and Play
Memory 7 - The Cowl Does Not Make the Monk
Memory 8 - With Friends Like These
When you complete the 8th Memory, the achievement will unlock