Story related and cannot be missed.
There are 6 memories in DNA Sequence 8, 3 of which have optional objectives which completing them during your initial run through will help you with another achievement later on.
Memory 1 - Requiem
- Do not be detected
Memory 2 - An Apple A Day
- Do not kill anyone
Memory 3 - The Apple of Eden
- Do not lose any health
Memory 4 - Demilitarization
- No optional objective
Memory 5 - Seeing Red
- No optional objective
Memory 6 - All Roads Lead To...
- No optional objective
Once you complete memory 6, the achievement should unlock for you.