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.