Solve the Three Judges

Completely upgrade all weapons

Acquire the Boreas Icestorm

Kill Cronos

Gut 3 Centaur Generals

Kill the Poseidon Princess

Kill Hermes and acquire his Boots

Cover Kratos in 500 buckets of blood by killing the enemies

Kill Hades

Upgrade any weapon to the next level

Kill Poseidon

Kill 5 enemies in a row using 5 different weapons or attachments in Single Player or Special Ops.