Gut 3 Centaur Generals

Kill the Poseidon Princess

Kill Hermes and acquire his Boots

Kill Helios

Kill 50 enemies by headshots.

Kill 750 enemies.

Complete story mission 3.

Kill 30 enemies by using the grappling hook and making them fall to their death.

Discover the secret 'Hades Arm' room

Acquire the Bow of Apollo

Drive 30 different vehicles.

Collect 100 resource items.

Complete story mission 1.