Get 100% Synch by performing the corresponding tasks at the Romulus Lair in the following missions:

MISSION - TASK
"The Halls of Nero" mission at the Terme di Traiano - Complete the memory within eight minutes.
"Wolves Among the Dead" mission at the Catacombe di Roma - Complete the memory within eight minutes.
"Thrown to the Wolves" mission at Il Colosseo - Do not lose more than three blocks of health.
"Leader of the Pack" mission at the Cloaca Maxima - Do not lose more than ten health squares.
"The Sixth Day" mission at the Palazzo Laterano - Do not lose more than a block of health.
"A Wolf in Sheep's Clothing" mission at the Basilica di San Pietro - Complete the memory within eight minutes.