Complete the required tasks to unlock each Achievement and Gamerscore:
A Gift from Beyond (15) - Earn a Rune.
A Toe into Madness (10) - Complete "The UAC" on Ultra-Nightmare.
An Old Friend (secret) (30) - Acquire the BFG.
Argent Fiend (30) - Fully upgrade Health, Armor, and Ammo capacity on a single campaign run.
Argent Overload (15) - Fully upgrade Health, Armor, or Ammo capacity.
Butcher (50) - Perform 200 Glory Kills.
Combat tested, Doomguy approved (30) - Reach Level 5 in Multiplayer.
E1M1 (25) - Complete the first mission of the campaign.
Entryway (20) - Complete the SnapMap Basic and Advanced Tutorials.
Every Nook and Cranny (30) - Find all Collectables.
Historian (25) - Find all Data Logs.
Hot Swapper (30) - Acquire all weapon mods.
IDDQD (100) - Upgrade all Runes.
IDKFA (50) - Earn the Masteries for all weapon mods.
Into the Unknown (secret) (15) - Warp to Hell.
IPXSETUP.EXE (15) - Win a Multiplayer Match.
Juicin' it Up (50) - Kill 150 enemies while using Power Ups.
Knee-Deep in the Dead (100) - Complete the campaign on "I'm too Young to Die", "Hurt Me Plenty", "Ultra-Violence", or "Nightmare".
Momentum Shift (25) - Upgrade a Rune.
No Rest for the Living (20) - Play 5 published SnapMaps.
Outnumbered? No Problem (secret) (25) - Defeat the Hell Guards.
Overclocked (50) - Fully upgrade all Praetor Suit categories on a single campaign run.
Rip and Tear (20) - Glory Kill all common enemy types in the campaign.
Shareware (10) - Create and publish a SnapMap.
Shoot it Until it Dies (secret) (25) - Defeat the Cyberdemon.
Specialist (20) - Earn the Mastery for a weapon mod.
The Circle is Complete (30) - Earn all Runes.
Thorough Shopper (20) - Complete all Challenges for a single mission.
Timing is Everything (30) - Use explosive barrels to kill 100 enemies.
Tinkering (15) - Fully upgrade a Praetor Suit category.
Up Close and Personal (25) - Kill 50 enemies using the Chainsaw.
What Else Ya Got? (35) - Complete all Mission Challenges on a single campaign run.
Who's Next? (secret) (25) - Defeat the Spider Mastermind.
Additionally, there are five Bloodfall DLC achievements:
Bowling for Gibs (20) - Perform a MultiKill with the Spectre demon in Multiplayer.
Fashion Fanatic (20) - Play a Multiplayer Match with a piece of Evil Cultist armor equipped.
Head First (20) - Kill 10 enemies with the Spectre demon in Multiplayer.
Insult to Injury (20) - Use a taunt from the Bloodfall DLC during a Multiplayer Match.
Successful Launch (20) - Kill 10 enemies with the Grenade Launcher in Multiplayer.
Additionally, there are five Hell Followed DLC achievements:
Beauty is Pain (20) - Play a Multiplayer Match with a piece of Cyber-Demonic armor equipped.
Eat your Vitamins (20) - Kill 10 enemies with the Cacodemon in Multiplayer.
Like Nobody is Watching (20) - Use a taunt from the Hell Followed DLC during a Multiplayer Match.
Reaping all the Benefits (20) - Kill 10 enemies with the Reaper in Multiplayer.
Threat Assessment (20) - Detect 20 enemies using the Threat Pulse in Multiplayer.