Complete 'Coming Home' on any difficulty.

Escape the restaurant in 'Laying Low' without being downed on any difficulty.

Kill 6 enemies in a row with a shotgun - all of them as one shot kills.

Kill Zeus

Collect all of the Phoenix Feathers

Acquire the Boreas Icestorm

Kill 10 enemies with exploding canisters.

Complete 'Welcome to Shanghai' on any difficulty.

Kill Cronos

Gut 3 Centaur Generals

Defeat 20 enemies with a single punch, after softening them up with gunfire

Defeat 50 enemies with stealth attacks

Complete a combo of 10 moves (any play mode)