Unlocking Achievements in Xbox 360 Doom/Xbox Live Arcade Doom, reference sheet:
Achievement Minimum requirement to unlock Achievement G
CLEAN SLATE Get a "KILLS 100%" score on any map at Skill 3 or higher 5
DESTROYER Get 100 Frags in Deathmatch-mode game(s) on Xbox Live 10
EPISODE ONE Exit all non-Secret maps in Episode 1 at Skill 3 or higher 25
EPISODE TWO Exit all non-Secret maps in Episode 2 at Skill 3 or higher 25
EPISODE THREE Exit all non-Secret maps in Episode 3 at Skill 3 or higher 25
EPISODE FOUR Exit all non-Secret maps in Episode 4 at Skill 3 or higher 25
HOARDER Get an "ITEMS 100%" score on any map 5
NEOPHYTE Exit any map at any Skill 20
NIGHTMARE Exit any map at Skill 5 10
RAMPAGE Exit all non-Secret maps in every Episode at Skill 4 or 5 35
ROOKIE Get 50 Frags in Deathmatch-mode game(s) on Xbox Live 10
SCOUT Find any Official (score-affecting) Secret area on any map 5
Notes: The "G" column shows the "Gamerscore" points for unlocking Achievements.
Achievements are only unlocked in Single-player games, except for DESTROYER and ROOKIE, which are unlockable only in Deathmatch-mode games over Xbox Live.
In general, unlocks only occur after players exit a map or complete an Episode.
Skill 1 ("Difficulty 1") is "I'm too young to die!", Skill 2 is "Hey, not too rough!", Skill 3 is "Hurt me plenty!", Skill 4 is "Ultra-Violence", Skill 5 is "Nightmare".
Note that Lost Souls ("flying skulls") are not counted when computing the KILLS score. As such, the CLEAN SLATE Achievement can be unlocked on any map even if Lost Souls remain when the player exits.
Unlocking the CLEAN SLATE Achievement can also unlock a "Marine" picture, which can be used when customizing Player Profiles. (This picture unlocks if "KILLS 100%" is attained on any map at any Skill.)
In order for "Frags" to be counted for the DESTROYER or ROOKIE Achievement, a Deathmatch game must reach a Fraglimit or Timelimit, and end by displaying the Tally Screen. (Frags are not counted for a Deathmatch player unless the Tally Screen at the end of the match is displayed for that player.)
For the EPISODE and RAMPAGE Achievements, it is not necessary to find or exit any Secret maps (each Episode has eight normal maps and one Secret map, which is accessible via a second, hidden exit on one of the normal maps). For a list of maps and their interconnections access: http://classicdoom.com/doomexit.htm
For the HOARDER Achievement, "ITEMS" include only Berserk Packs, Blur Artifacts (also called Partial Invisibility), Computer Maps (also called Computer Area Map), Health Potions (blue bottle, also called Health Bonus), Invulnerability Spheres (green sphere), Light Amplification Visors, Soul Spheres (blue sphere, also called Supercharge), and Spiritual Armor (green helmet, also called Armor Bonus). All other objects in the game can be ignored.
Note that unlocking the NIGHTMARE Achievement also unlocks a "Demon" picture, which can be used when customizing Player Profiles.
To unlock the SCOUT Achievement a player must step onto any horizontal surface that is flagged as a score-affecting secret area. For more information on score-affecting secrets in Doom games access: http://classicdoom.com/maxsec.htm
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