Kill only a single enemy with a BFG9000 blast.

Get 3 multi-kills with the Shotgun.

Kill all monsters in any monster-filled level on 'Hurt me plenty' or higher.

Shoot 200 bullets consecutively with the Chaingun.

Cause an enemy to kill another enemy.

Complete the game on Hard Difficulty

Collect all Artifacts in the game

Use the Eyes of Truth successfully

Complete the slide in the Statue of Apollo without dying

Slow 100 Enemies with the Amulet of Uroborus

Complete the Screw of Archimedes without getting hit by the Fire Traps

Use All 5 World Weapons in Combat