Spend 8 Sentinel Batteries in the Fortress of Doom in a single save slot

Changed into the Festive Fellow Outfit.

Rescued a Bot in Helium Heights.

Rescued a Bot in Let It Slide.

Kill 5,000 enemies.

Complete the campaign.

Upgrade your Healing Potion to max tier.

Play a planet defense mission.

Kill 666 Ghosts, Skeletons, or Zombies.

Kill 666 Demons, Fallen, or Goatmen.

Kill 150 enemies during the same mission.

Fire at least 150 rounds in one burst, killing at least 10 enemies.

Kill a target at a distance of over 100m.