To unlock this achievement, you need to complete Memory Sequence 5.
This is story-related and cannot at all be missed.
Memory 1 Challenges
- Brutes Driven Berserk
- Doors Lockpicked
Memory 2 Challenges
- Pistol Kills
- Passed objects under or over them
Memory 3 Challenges
- Alarm Bells Sabotaged
- Cover Kills