The Joys of Freedom - Complete Memory Sequence 8.
This is a story achievement and cannot be missed if you play the story. The Memory Sequence consists of 4 memories. This is how they are labelled in the game:
1 - Strange Bedfellows
2 - Triple Theft
3 - Fun and Games
4 - Final Act
Memory 4 - Final Act is the final memory and can only be accessed once all other memories are done. The achievement will pop once it finishes.