Hit all targets in the attic with the toy gun

Perform an Execution Streak of 10 kills.

Achieve 100% Synchronization in any Sequence other than Sequence 1.

Discover the Shrine in the Catacombe di Roma.

Pay 500 florins to an orator, then pickpocket him afterward.

Discover the Shrine in the Terme di Traiano.

Find 1 Artifact in 2012.

Finish the Game on Hard Without Changing the Difficulty

Finish the Game on Easy Without Changing the Difficulty

Kill 30 Enemies with the T-Bolt Sniper

Kill 30 Enemies with the M9

Kill 20 Enemies with Gunfire While Hanging

Kill 30 Enemies with the Mk-NDI