Half-Life 2: Episode One Achievements Full list of all 13 Half-Life 2: Episode One achievements. It takes around 3-4 hours to unlock all of the achievements in the base game on Windows.The base game contains 13 achievements, and there is 1 DLC pack containing 0 achievements.Filter Achievement View View Image viewList view Sort by Won first then by TrueSteamAchievement desc TrueSteamAchievement asc Achievement name desc Achievement name asc TSA Ratio desc TSA Ratio asc Gamers desc Gamers asc Steam order Date won desc Date won asc DLC Packs Group DLC packs together in list DLC Filter AllOwnedNone Flag Filter All None 13 Offline Mode 13 Single Player 5 Main Storyline 7 Missable 3 Cumulative + Link flagsOR joinAND join Achievements without these flags What are achievement flags? Click to find outApply AllWonNot won Base Base Game (Excludes DLC) 159 13 4.3911,5004,274 (37%)3-4h Zombie-queUse flares to light 15 zombies on fire. 29 May 2015 - Add a guideEscape From City 17Escape City 17 with Alyx. 29 May 2015 - Add a guideThe One Free BulletFinish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay! 29 May 2015 - 1 guideCitizen EscortDon't let any citizens die when escorting them to the escape train. 29 May 2015 - 1 guideAttica!Destroy the gunship in the hospital attic. 29 May 2015 - Add a guideLive BaitHelp Alyx snipe 30 enemies in Episode One. 29 May 2015 - 1 guideCar CrusherUse the cars to squash 15 antlions in Episode One. 29 May 2015 - 1 guideElevator ActionSurvive long enough to get on the parking garage elevator. 29 May 2015 - Add a guideContainmentContain the Citadel core. 29 May 2015 - Add a guidePacifistContain the Citadel core without killing any stalkers. 29 May 2015 - 1 guideConservationistKill five enemies with the same energy ball. 29 May 2015 - 1 guideWatch Your Head!Make it to the bottom of the Citadel's main elevator shaft in one piece. 29 May 2015 - Add a guideThink Fast!Kill an Elite Soldier with his own energy ball. 29 May 2015 - 1 guide