The Doom Alphabet Game

[Blue Shadow]

Eternity Engine

[Tristan]

F_SKY01

[Fernito]

Grosse.

[DoomUK]

Halls of the Damned

[purist]

Intermission music

[darkreaver]

jDoom

[cannonball]

Kaiser

[TwinBeast]

Light Amplification Visor

[glenzinho]

MARBFACE

[ASD]

Nirvana

[Looper]

ocelot

[Jimothy]

(The) Plutonia Experiment

[Patrol1985]

rocket launcher

[Doominator2]

Man Im stumped so il have to go with this

Q
A letter found in the cheat code iddqd.

[CorSair]

Q and R switched places. :P

Continuing...
Super Shotgun

[Velvetic]

TNT

[TwinBeast]

Ultra-Violence.

[Patrol1985]

Vanilla Doom (my bad about switching "q" and "r")

[purist]

Warrens

[darkreaver]

Xenomorph (?) I never played it, but I guess its in Aliens TC?

[DoomUK]

You Have Huge Guts

(Xbox Live Doom 2 achievement, which I presume counts)

[Patrol1985]

Z-sec

REEEESET :D

[darkreaver]

Ok one more:

Arachnatron

[purist]

Bezerk

[glenzinho]

Chaingun

[Kotzugi]

Deathmatch

[Springy]

Eon

Kotzugi said:

Deathmatch

[Avoozl]

F_Sky

[Gez]

Go 2 It

[Six]

Edit: Dammit, post snipped.

I dunno...

"Hell"

There.