First kill with a Nail Bat.

Unlock 5 locked doors.

Killed a Collared Minion with a collar detonation.

Used Health Syringe for the first time.

Died once.

Unlocked first door.

Kill first minion.

Unlock first container.

First encounter with Pighead.

On chapter III, kill 20 armed enemies while riding the stagecoach.

Get all Hidden Blades, Item Pouches and Armor upgrades for Ezio.

Discover the Assassin's Tomb inside Santa Maria della Visitazione.

Find the 8 statuettes in Monteriggioni.