Get a 200 Hits Combo

Acquire Blade of Artemis

Rescue the Oracle with 10 seconds to spare

Die enough times to get offered Easy mode

Win the first Minotaur fight

Retrieve the Captain's Key

Get all of the Trophies in the game.

Use only Reflectors to destroy the generators in Phonica Moon's security tunnels. (2P +)

Kill 50 enemies in a row using melee without taking damage.

Fully upgrade all weapons.

Kill eight enemies in eight seconds using the Darkstar Fission Tether with two or more teammates.

Destroy 30 enemies while they're distracted by the Doppelbanger.

Kill 15 enemies that have been slowed down by the Zoni Blaster.