Memory 8 - The Mentor's Keeper - Assassin's Creed: Revelations

Full Sync - Save all citizens under attack.  

Upgrade and Explore, Assassin's Creed Wiki

Memory 8 - The Mentor's Keeper - Assassin's Creed: Revelations Guide - IGN

The Mentor's Keeper, Assassin's Creed Wiki

Fond Memories achievement in Assassin's Creed: Revelations

Assassin's Creed Revelations 100% Synch Walkthrough - Sequence 8 - Memory 3 - End of the Road

Assassin's Creed: Revelations - Sequence 3 - Mission 8 - The Mentor's Keeper (100% Sync)

Memory 10 - The Sentinel, Part II - Assassin's Creed: Revelations Guide - IGN

Assassin's Creed Revelations 100% Synch Walkthrough - Sequence 3 - Memory 8 - The Mentor's Keeper