Quake

Great Old One You have conquered all the realms of the Elder Gods. Congratulations.

Sink the Horror Electric Complete Quake Episode 1: Dimension of the Doomed in single player.

Bottom Of The Well Complete Quake Episode 2: The Realm of Black Magic in single player.

Beneath The Blue Chambers Complete Quake Episode 3: The Netherworld in single player.

The Last Unexplored Path Complete Quake Episode 4: The Elder World in single player.

Indigestion Defeat Shub-Niggurath in single player.

Gateway Traveller Complete Scourge of Armagon Episode 1: Fortress of the Dead in single player.

Dominated Dominion Complete Scourge of Armagon Episode 2: Dominion of Darkness in single player.

Arma-gone Complete Scourge of Armagon Episode 3: The Rift in single player.

Overlord Overdone Complete Dissolution of Eternity Episode 1: Hell's Fortress in single player.

Dragonslayer Complete Dissolution of Eternity Episode 2: The Corridors of Time in single player.

The Year Zero Complete Dimension of the Past in single player.

Vengeance Denied Complete Dimension of the Machine in single player.

Vertical Vengeance Find the secret exit in Quake Episode 1: Dimension of the Doomed.

Nevermore Find the secret exit in Quake Episode 2: The Realm of Black Magic.

The Hot And Winding Road Find the secret exit in Quake Episode 3: The Netherworld.

Into Sandy's City Find the secret exit in Quake Episode 4: The Elder World.

Military Complex Find the secret exit in Scourge of Armagon Episode 1: Fortress of the Dead.

The Gremlin's Domain Find the secret exit in Scourge of Armagon Episode 2: Dominion of Darkness.

A Long Yard Find the secret exit in Scourge of Armagon Episode 3: The Rift.

The House of Doom Find the secret exit in Dimension of the Past.

Sandy's Room Find the secret exit in Dimension of the Machine.

Secret Sleuth Find a secret area.

The Well of Wishes Find the Well of Wishes in the Crypt of Decay.

You're not supposed to be here! Find the secret message in Tur Torment.

Friendly Fire Kill a monster with another monster's attack.

Discharge In deathmatch, electrocute an enemy in water without dying.

The Shambler Dance Kill a shambler before it is able to cast its lightning attack.

A Close Shave Kill a shambler with an axe.

The Painless Maze Complete E4M6: The Pain Maze on Nightmare without taking damage.

Slipgate Pacifist Complete E1M1: The Slipgate Complex on Nightmare without firing a shot.

Shub's Bud Complete Quake on Nightmare in single player.

Scourge Done Slick Complete Scourge of Armagon on Nightmare in single player.

Rogue Ranger Complete Dissolution of Eternity on Nightmare in single player.

Otherworldly Complete Dimension of the Past on Nightmare in single player.

Machinehead Complete Dimension of the Machine on Nightmare in single player.