Complete "Bleak Falls Barrow"

Reach the maximum player level in the multiplayer

Participate in 100 fights in multiplayer

Complete every Business Rivals mission

Complete every Free Slaves mission

Kill 5 guards in 15 seconds using only the Sugarcane Machete (without using the Chain Kill)

Synchronize all viewpoints

Collect every Mayan statuette

Kill an enemy from a tree, with the blowpipe, while using eagle vision

Kill all Citizen E and experience the true ending

Complete Sequence 8

Complete every Pirates mission