Quake

Rogue Ranger

Complete Dissolution of Eternity on Nightmare in single player.

Machinehead

Complete Dimension of the Machine on Nightmare in single player.

Scourge Done Slick

Complete Scourge of Armagon on Nightmare in single player.

Otherworldly

Complete Dimension of the Past on Nightmare in single player.

The Painless Maze

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

Discharge

In deathmatch, electrocute an enemy in water without dying.

Shub's Bud

Complete Quake on Nightmare in single player.

The Gremlin's Domain

Find the secret exit in Scourge of Armagon Episode 2: Dominion of Darkness.

Sandy's Room

Find the secret exit in Dimension of the Machine.

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.

You're not supposed to be here!

Find the secret message in Tur Torment.

Slipgate Pacifist

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

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.

Vengeance Denied

Complete Dimension of the Machine in single player.

The Year Zero

Complete Dimension of the Past in single player.

Dragonslayer

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

Overlord Overdone

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

Arma-gone

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

Dominated Dominion

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

The Well of Wishes

Find the Well of Wishes in the Crypt of Decay.

Gateway Traveller

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

Nevermore

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

A Close Shave

Kill a shambler with an axe.

Indigestion

Defeat Shub-Niggurath in single player.

The Last Unexplored Path

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

The Hot And Winding Road

Find the secret exit in Quake Episode 3: The Netherworld.

Beneath the Blue Chambers

Complete Quake Episode 3: The Netherworld in single player.

Vertical Vengeance

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

Bottom of the Well

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

Sink the Horror Electric

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

The Shambler Dance

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

Friendly Fire

Kill a monster with another monster's attack.

Secret Sleuth

Find a secret area.