Insert 12 maximum level cores into a legendary quality weapon

Achieve mastery level 10 with the Kugelgewehr.

Achieve mastery level 10 with the Sturmgewehr.

Find all 3D glasses.

Find all Floppy Disks.

Find all Cassette Tapes.

Complete all missions.

Equip every weapon and equipment slot with at least a level 30 legendary weapon or equipment

Kill 100 enemies while dual-wielding.

Enter all Undergrounds.

Open 200 supply crates.

Obtain the God Key.

Enter the Lab X.