Note. Every Romulus shrine is marked on the map with a Wolf Icon.

Undertaker 2.0  Shrine in the Catacombe di Roma
Location. Antico District in front of  Piramide Cestia. Loot the Scroll of Romulus and 
exit.

Gladiator  Shrine in Il Colosseo.
Go to the Colloseum to find the entrance. Once in, you fight a small group of enemies then
follow a guy. Once the guy is dead you will fight another group of enemies. See them off, 
loot and leave to get the achievement/trophy.

Plumber  Shrine in the Cloaca Maxima
Find the entrance, which is tricky, refer to video for help. Then follow the 3 leaders of
Romulus and kill anyone who gets in your way. At the end you will fight couple groups of 
enemies along with the final leader to get the scroll.

Amen  Shrine in the Basillica di San Pietro
Chase the target and kill him.