Mother May I?

Defeat the Mother of All Demons on The Absolution 6.7%

Very Rare 24.92%

Uncommon

Walk the Path

Finish the Lost Levels mission 4.4%

Ultra Rare 21.88%

Uncommon

Secret Sleuth

Discover a secret area 68.2%

Common 74.72%

Common

Unholy Firepower

Find the Unmaker 13.9%

Very Rare 31.14%

Uncommon

Persistence is the Key

Acquire all 3 Demon Key Artifacts in the main campaign 3.5%

Ultra Rare 20.97%

Uncommon

Rip and Tear!

Kill a Cyberdemon 9.9%

Very Rare 27.10%

Uncommon

That was Fun

Finish a 'Fun' Level 3.5%

Ultra Rare 22.19%

Uncommon

RVNH3CT1CD3M0???

Locate the secret level 'Hectic' 5.9%

Very Rare 25.01%

Uncommon