All Is Fair in Politics - Complete Memory Sequence 7.
This is a story achievement and cannot be missed if you play the story. The Memory Sequence consists of 6 memories. This is how they are labelled in the game:
1 - Playing Politics
2 - The Bodyguard
3 - Driving Mrs. Disraeli
4 - Motion to Impeach
5 - Unbreaking the Bank
6 - Change of Plans
Memory 4 - Motion to Impeach is the final memory and can only be accessed once all other memories are done. The achievement will pop once it finishes.