Kill 5 enemies in a row while your health is below 10 HP.

Kill a Witchbride using C4.

Die HAARP With A Vengeance.

Recover the alien artifact located by Dr. Stein.

Recover a key stolen by a cultist.

Spend 1000 minigun rounds while firing continuously.

Kill 3 enemies with a double shotgun blast.

Save the rookie. Find Father Mikhail. See the sights.

Complete the story.

Allow Rose to see the meteor shower.

Squeak 100 times.

Unlock the special costume from Kishine.

Sleep on the top of a Kibblin-Box.