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

Full Sync - Save all citizens under attack.  

Seal the Deal achievement in Assassin's Creed: Revelations

Fond Memories achievement in Assassin's Creed: Revelations

Memory 2 - The Sentinel, Part I - Assassin's Creed: Revelations Guide - IGN

The Mentor's Keeper, Assassin's Creed Wiki

The Mentor's Return, Assassin's Creed Wiki

Memory 8, Sequence 3 - Lost and Found - Assassin's Creed: Revelations Game Guide & Walkthrough

The Mentor's Keeper - Assassins Creed Revelations (100% Sync)

Memory 1 - The Prisoner - Assassin's Creed: Revelations Guide - IGN

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

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

Memory 7 - Quid Pro Quo - Assassin's Creed: Revelations Guide - IGN

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