Beat the first stage of the game.

Vanquish 25 Enemies.

Vanquish 100 Enemies.

Vanquish 300 Enemies.

Pickup 100 Health.

Pickup 100 Armor.

Pickup 300 Health.

Pickup 300 Armor.

Fire your first weapon 100 times.

Find 10 Secret Areas.

Find ALL Secret Areas.

Pickup 3 Permanent Health Upgrades.

Pickup 3 Permanent Armor Upgrades.

Pickup 3 Permanent Ammo Upgrades.

Pickup ALL Permanent Health Upgrades.

Pickup ALL Permanent Armor Upgrades.

Pickup ALL Permanent Ammo Upgrades.

Obtain the First 3 Weapons and their Alt-Fire Upgrades.

Obtain ALL the Weapons and their Alt-Fire Upgrades.

Beat the Final Stage.

Beat the third stage in Heroic Mode.

Find and read ALL the Log Files.

Destroy 500 enemies in Heroic Mode.

Beat the final stage in Heroic Mode.

Get all the other achievements.