Half-Life 2: Episode Two Achievements Full list of all 23 Half-Life 2: Episode Two achievements. It takes around 6-8 hours to unlock all of the achievements in the base game on Windows.The base game contains 22 achievements, and there are 2 DLC packs containing 1 achievements.Filter Achievement View View Image viewList view Sort 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 23 Offline Mode 23 Single Player 6 Main Storyline 4 Collectable 1 Missable 1 Cumulative + Link flagsOR joinAND join What are achievement flags? Click to find outApply Acid ReflexKill an acid antlion worker. 1 guideGet Some GrubSquish every antlion grub in Episode Two. 1 guidePiñata PartyFind and break every web cache in Episode Two. Into the BreachHelp Griggs and Sheckley hold off the antlion invasion inside the mine shaft. 1 guideTwoferDefeat both antlion guards outside the White Forest. Hit and RunRun over 20 enemies with the car in Episode Two. Meet the HuntersSurvive the Hunter ambush with Alyx. Puttin' On a ClinicDefeat the chopper in Episode Two without any misses. Gunishment!Destroy the Combine Autogun in the junkyard. Cache CheckerFind every radar cache in chapter Under The Radar. Pedal to the MetalBeat DOG in a race to the White Forest base. Gordon Propelled RocketUnlock the rocket launcher lambda cache in chapter Under The Radar. Quiet Mountain GetawaySurvive the ambush at White Forest Inn. Little Rocket ManSend the garden gnome into space. Secondary Silo SecuredSecure the launch doors on missile silo 2. Neighborhood WatchSave all buildings outside the missile silo from destruction. 1 guideDefense of the ArmamentSave the missile silo from the Combine offensive. PaybackKill a Hunter with its own flechettes. Bone BreakerKill 30 enemies with thrown physics objects. Deadly HarvestKill an enemy by planting a hopper mine. 1 guideHot Potat0wnedKill a Combine soldier with his own grenade. Grave RobberSteal a Zombine's grenade. 1 guide Update Gnome Chompski 15 10 1 3.565,1505,150 (100%)0-1h Gnome AloneIf you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space. If you did not also receive the achievement 'Manufacturing Ascent', Newell has abandoned his plans to shoot Noam Chomsky into space. 1 guide