Complete a Level with 100% Kills, Items and Secrets in singleplayer.
Find a Secret in any Level in singleplayer.
Complete any Level in any difficulty in singleplayer.
Complete the Ultimate DOOM single player campaign on "I'm Too Young to Die!" or higher.
Complete the DOOM 2: Hell on Earth single player campaign on "I'm Too Young to Die!" or higher.
Kill a CyberDemon with your fists in singleplayer.
Kill 20 enemies with your chainsaw on a single map in singleplayer.
Kill 20 enemies while in berserker mode on a single map in singleplayer.
Complete the Final DOOM: TNT Evilution single player campaign on "I'm Too Young to Die!" or higher.
Complete the Final DOOM: Plutonia Experiment single player campaign on "I'm Too Young to Die!" or higher.
Complete the DOOM 2: Master Levels single player campaign on "I'm Too Young to Die!" or higher.
Complete the DOOM 2: No Rest for the Living single player campaign on "I'm Too Young to Die!" or higher.
Find a BFG in singleplayer.
