Kill Juggernaught.
Kill Orbital Destroyer.
Kill Anachos.
Kill Solar Axis.
Kill Abyss on Normal difficulty or above.
Kill Leviathan on Normal difficulty or above.
Kill Dreadnought.
Kill Gargantua.
Kill Charybdis.
Kill Asteroid Spore.
Kill Anubis.
Kill Loki.
Finish Episode 1.
Finish Episode 2.
Finish Episode 3.
Finish Episode 4.
Defeat Heart of Darkness on rookie difficulty.
Unlock Level 4 Spells.
Fully Upgrade Primary Weapon.
Fully Upgrade Armor.
Fully Upgrade Life Capacity.
Finish Game on Impossible.
Defeat Heart of Darkness on normal difficulty or higher.
Defeat Heart of Darkness on veteran difficulty or higher.
Defeat Heart of Darkness on hardcore difficulty or higher.