Achievement Breakdown:
Story Related: (8)
Missable: (1)
Collectibles: (4)
Slay: (7)
Miscellaneous: (3)

All Achievements of Half Life 2 – Episode 2 can be earned in one playthrough. There are quite a few missable Achievements however so stay vigilant. In this Episode we have to squish Antlion Grubs for an Achievement, there are A LOT of them, so be patient. Grubs can be killed by the Gravity Gun so save the ammo when you can. Some Grub are far out of range & having the Pistol is almost essential for success. The good news is these are only found on two Chapters. The bad news is these are only found on two Chapters, which means these first Chapters are going to take the longest to complete.

Unfortunately, that will not be all our tedium. Another important Achievement will be the Little Rocket Man. In the first Chapter we will find a garden gnome. We must then carry this gnome aaaalllll the way to Chapter 6 & launch him into space. Save often as redoing sections because you forget him a long way away, redoing sections will become a real pain. There is no Achievement associated with Difficulty so play on whichever setting you like.

*This guide contains minor spoilers.

1. Complete To the White Forest
2. Antlion Grubs: 91/333
3. Achievements: 3/23
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Achievement #1 – Gnome Alone: If 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.
Story Related. I am a little fuzzy on the lore behind this Achievement, but all we have to do to unlock it is load Half Life 2 - Episode 2 & reach the games Main Menu, & the Achievement will unlock as easy as that. It will be the very first Achievement you unlock.

If for whatever reason the Achievement does not unlock, & or you have already gotten 22/23 Achievements before the update; try clearing the games Cache, or reinstalling the game.


Achievement #2 – Grave Robber: Steal a Zombine’s grenade.
Shortly after entering the mines at the beginning of this Chapter we will begin seeing Zombies again. Among them, will be Zombines. These guys will occasionally whip out grenades & run at you with them. Yank the grenade out of their hands with the Gravity Gun to unlock the Achievement.

Gnome Chomsky: After the first encounter with the Zombies, we will enter the communications room. Inside, we can find Gnome Chomsky underneath a wooden shelf to the right of the exit of this room. At least we can use him as a projectile… not really. Carry him in your hands or with the Gravity Gun, & prepare to take him on a journey no Gnome has been on before... For the Little Rocket Man Achievement, we have to take this Garden Gnome all the way to Chapter 6 Our Mutual Friend & place him inside a rocket to be shot into space.

Grub #1-5: Make your way through the mines until you drop down a short series of holes. The final drop will put you into some water, with the Handgun being in the tunnel ahead. While in the room with the water, look back up where you dropped from to see the first 5 Grubs along the walls. They are white & glow yellow, they will also make an audible screeching sound which can be useful.

Grub #6-11: From these Grubs, make your way down the tunnel. 3 Grubs will be on the way to a web. The other 3 Grubs will be on/below the web in front of you.

Grub #12-14: After the web, enter the next chamber. 2 Grubs will be on your left & 1 Grub will be across the small pool up to the left in a web.

Grub #15-19: Leave this chamber & enter the next tunnel. 3 Grubs will be on your left shortly after entering, & another 2 Grubs can be found on the way to the next web blocking this tunnel.

Grub #20-23: There will be 1 Grub on the web blocking the tunnel, 2 Grubs right below it, & 1 more Grub on the wall left of the web on the other side.


Achievement #3 – Acid Reflex: Kill an Acid Antlion worker.
From the last Grubs, drop down the hole & you will be attacked be a glowing green Antlion. These guys fire toxic goop at you & more often then not will kill Grubs making it irritating finding them afterwards. Kill it to unlock the Achievement.

Grub #24-26: Turn around from where you dropped in from to see a dead end made up of a web wall. There will be 3 Grubs to the right of this wall.

Grub #27-28: Enter the side room where you find the Shotgun. 1 Grub will be directly across from the hole we have to drop down next. Walk around the hole towards #27, & there will be a blue locker. Open it up to find 1 Grub.

Grub #29-32: 1 Grub will be at the top of the hole we drop down next. Another 1 Grub at the bottom. We can find 1 Grub in some webbing in our way down the tunnel ahead, & 1 last Grub at the mouth of the tunnel exit leading up.

Grub #33-34: This next room is large & will have a lot of Grubs. The Antlions may kill some, so try & keep track as best you can. We can see a lot of them, but for simplicity sake, do not shoot them until you are directly below them. The first 2 Grubs of this room will be right in front of you on the first rock slab leading up.

Grub #35-49: There will be a web in your way with 1 Grub on it. Another 2 Grubs will be on the floor directly in front of you. 4 more Grubs are on the wall to your right. (The ones below a hole in the wall).

Now drop back into the water below & look up. There are 3 Grubs above the hole in the wall where we took out the last Grubs. Above them is a glowing yellow hole in the wall. There are 2 Grubs below it & another 3 Grubs a bit above it to the left. Hopefully you have some Pistol ammo to take care of this…

Grub #50-56: Head back up the ramp where you were & jump into the water, there will be 2 Grubs beside a Battery Pack. Now look back where you came. There is another glowing hole in the wall. 4 Grubs will be around the hole & 1 Grub can be found inside the hole on the right wall.

Grub #57-60: Enter the next room. We can find 2 Grubs on the second alcove on the left. Across from us, we can find 1 Grub inside an underwater tunnel, & 1 more Grub on the wall above it.

Web Cache #1: Now, while in this same room, enter the lake in front of you & swim down to the left. There will be a glowing web with corpses behind it. Smash it open, then swim down & bust another web with a Battery Pack below it. There are 8 more Web Caches we need to raid for an Achievement…

Grub #61-67: Swim through the underwater tunnel we found a Grub in to enter the next chamber. There are 2 Grubs immediately on our right when we enter. Another 2 Grubs will be on the floor near a shovel in the center of the room.

Past the last two Grubs, look along the right wall past a wooden boat for 2 more Grubs. Another 1 Grub can be found across from these ones on the wall.

Grub #68-70: Carry on to the back of this room. At the end of the Barnacles you can find another 2 Grubs on the floor. 1 more Grub can be found on the wall to the right of these ones.

Grub #71-72: Leave the Barnacle room. The next 2 Grubs can be found on the floor after the final Barnacle in the tunnel.

Grub #73-77: Enter the next chamber & you will be attacked by Antlions. There are 4 Grubs on the wall at the beginning off your left. 1 more Grub can be found at the end of this room on the other side of the water.

Grub #78-80: Head down the next tunnel. 2 Grubs can be found in your way on the left. 1 more Grub can be found shortly afterwards off your right before entering the next chamber.

Grub #81-87: You will enter a large chamber where some Acid Antlions will attack you. Near the entrance where you enter, 1 Grub can be found just off your right on the floor. Directly across from this Grub, look up to your left. There is a small side tunnel where 1 Grub will be.

There is a pillar in the center of this room. On the opposite side of it, there are 3 Grubs. When you go to leave this room, 2 more Grubs can be found near the exit beside a rib cage.

Grub #88-91: There will be a web blocking our way. There will be 1 Grub on the web & another 2 Grubs just below it. The last 1 Grub to be found on the Chapter will be right before the next tunnel a little ways below the web.

Gnome Check! Do you have Gnome Chomsky with you?

1. Complete Vortal Coil (Part 1)
2. Antlion Grubs: 185/333
3. Web Caches: 5/9
4. Achievements: 5/23
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Grub #92-93: 2 Grubs are found right in front of you in tunnel when the Chapter begins.


Achievement #4 – Deadly Harvest: Kill an enemy by planting a Hopper Mine.
When we drop down the hole, we will find two Resistance fighters & the Vortigaunt healing Alyx.
We are about to be assaulted by Antlions so prepare. There are two crates off to the side full of Hopper Mines. Plant some down a bunch of the tunnels & you should be guaranteed in killing an Antlion with them.


Achievement #5 – Into the Breach: Help Griggs & Sheckley hold off the Antlion invasion inside the mine shaft.
Story Related. After the final last stand against the Antlions with the assistance from the Vortigaunts the achievement will unlock.

For this Chapter, we will be leaving & returning to this area to revive Alyx. If you leave the Gnome somewhere close to Alyx (or just somewhere you will remember him) he will stay here for when we return. This takes a lot of hassle out of this Chapter, as we will only have to focus on the last few Grubs. Shout out to CyrdoFoX & Wolfindex for confirming this for me!

Grub #94-98: Follow the Vortigaunt down the tunnel & into the side passage. 3 Grubs can be found right in your way. Another 2 Grubs will be found a little ways ahead.

Grub #99-102: 1 Grub can be found down the tunnel outside of Web Cache #2, another 3 Grubs behind the it.

Web Cache #2: Hard to miss. This will be right in your way along the tunnel.

Grub #103-105: Just to the right of the Web Cache will be a web blocking the tunnel. There are 3 Grubs just to the left of it on your side of the web.

Grub #106-111: After the web you will enter a large chamber. There are 3 Grubs just on the other side of the web blocking access. Drop down & 1 Grub will be just below the ledge you were on. Follow the path along left to find 2 Grubs hanging off the wall to the left.

My game gave me a message saying 111/333 Grubs killed so hopefully yours says the same at this point. The game tracks the Grub numbers at this point.

Grub #112-118: Carry on down the path. 1 Grub will be on the floor right in front of you. Head up the path & look immediately to your left to see a small alcove with 2 Grubs on the wall. From these Grubs, walk over to the large stalactite hanging from the ceiling into the hole of the center of the chamber. Look up, & 2 Grubs will be hanging off the ceiling of the chamber. The final 2 Grubs in this room will be on the ground before the tunnel begins narrowing again in the back. (These were killed by an Acid Antlion in my game so if you don’t see them look for the orange glowing blood spatter).

Grub #119-120: Leave this chamber & head down the next tunnel. At the corner will be Web Cache #3. There are 2 Grubs behind it.

Web Cache #3: Off the corner of the tunnel when you leave the large chamber.

Grub #121-130: Enter the next large chamber. There will be 2 Grubs on the floor at the beginning. (Antlions killed one & it disappeared on me). Head further around into the chamber. 4 Grubs can be found hanging off the wall up to the left. Carry on & there will be a narrow switchback leading you up. 1 Grub can be found in your way on the ground. 1 more Grub will be off your right walking up the other side of the switchback. The final 2 Grubs of this chamber will be on the ground of the tunnel leading out. (Once again, I had these killed by Antlions).

Grub #131-134: 2 Grubs can be found at the end of this tunnel leading out. (I had these killed by Antlions as well, gee-dang-it). Carry on & look up to find Web Cache #4, it will have 2 Grubs behind it.

Web Cache #4: On the ceiling up to the left after leaving the last large chamber.

Grub #135-139: Head down the tunnel, 3 Grubs can be found on the floor in your way. Another 2 Grubs can be found on the wall to your right further down.

Grub #140-142: Walk down the tunnel until you see a red blood spatter on the ground. Look up to your right to see 2 Grubs on the wall below a Web Cache. 1 Grub can be found up behind the cache.

Web Cache #5: Above the red blood spatter you find down the tunnel. There are two webs to destroy. The first one will drop a live grenade at you so watch out. The second web will have the Cache & the Grub behind it.

Grub #143-148: Drop down into the next large room. 3 Grubs can be found in the left corner from where you came in. You can see some Grubs in front of you behind a fence & to the right in a room full of Zombies. Do not shoot the Grubs behind the fence yet. Instead, bust open the boards & enter the Zombie room. There are 3 Grubs in the same room as the Zombies.

Grub #149-151: Leave the rest of the Grubs up here. Go & stand on the weighted elevator & ride it down. As we ride the elevator down, there will be 3 Grubs hanging off the right wall of the shaft. There are Zombies up ahead & afterwards, try killing them with Gravity Gun objects for the Bone Breaker Achievement.

Grub #152-159: At the bottom of the elevator, there will be 3 Grubs to the left of where you get off & 2 Grubs to the right. There are anther 3 Grubs found behind a fence down the tunnel ahead of you.

Grub #160-165: Go into the next room. There will be 1 Grub on your left on the ground. There is 1 Grub underneath the next elevator that goes up. There is another 2 Grubs on the other side of this elevator. Before activating the elevator, look up the shaft to see 2 Grubs hanging off the wall.

Grub #166-171: Ride the elevator up. There is a group of 2 Grubs & 3 Grubs on the ground. (These all got crushed when I was fighting the zombies). 1 more Grub will be on the wall behind the elevator.

Grub #172-176: Go through the generator opened gate. There is 1 Grub on the back of a minecart train. The mine cart will fall down into a gorge. Look out to the right where it fell, there will be 4 Grubs hanging off the wall up near a glowing hole.

Grub #177-185: Carry on & there will be a line of 9 Grubs along a rail track. Seven of these will get squished by a minecart that gets knocked down by a Zombie. The two that are off the right of the tracks will have to be killed manually.

1. Complete Vortal Coil (Part 2)
2. Antlion Grubs: 328/333
3. Web Caches: 9/9
4. Achievements: 7/23
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Grub #186-197: You will drop down into a minecart & it will take you past a lot of Grubs. Do not try shooting any, we can walk back up where we started to efficiently get them. (2 Grubs may be crushed by the cart as it goes down so check your Grub count if you have 186 or 187). (They were not killed for me).

From the water, kill the first 3 Grubs on the wall before climbing up the ladder. Climb up & look back down the shaft. There will be 3 Grubs above you on the left wall, 1 Grub directly below you, & 2 Grubs on the right wall, with 3 Grubs a little ways below them.

Grub #198-209: Now turn around & begin heading up the tracks. At the bottom of the tracks, there are 3 Grubs hanging off the ceiling leading into the next tunnel with 3 Grubs sitting right beside the tracks here. Further up the tracks, there are another 3 Grubs to the left of the tracks & 3 Grubs hanging off the ceiling close to them.

Grub #210-216: Drop into the next large chamber. There are 3 Grubs just down to the left. Across from these guys on the wall to the right will be 2 Grubs. Another 2 Grubs can be found at the cliff edge.

Grub #217-226: Head around the corner & you can see 4 Grubs up in a glowing hole across from you before walking along the narrow bridge. There is 1 Grub a little ways above that hole. Now look even further up the same wall. Way at the top near the ceiling is another hole with 5 Grubs just above it.


Achievement #6 – Bone Breaker: Kill 30 enemies with thrown physical objects.
Drop down into the area with all the Antlions & Zombies, this is another good area to start getting Gravity Gun object kills. There are so many opportunities to earn this Achievement later on so do not fret. Note that Exploding Barrels do not count as physical objects for the Achievements.

Grub #227-232: Head up the elevator & drop through a section of floor. Break down a grate & there will be 2 Grubs on the wall ahead of you. Look right above you now, there are 2 more Grubs on the ceiling. On your left, there will be 2 Grubs just on the other side of a broken section of boards,

Grub #233-236: Now take the path on the right & break another grate & find 4 Grubs on the ground near some tracks.

Grub #237-240: Jump across the elevator & crawl under the wind turbine. Follow the vent along & there will be 1 Grub right in your way. On the other side of a hole in the vent will be 2 Grubs. Before dropping down, look into the hole. There will be 1 Grub hanging off the wall in the hole.

Grub #241-246: Drop down the hole. There will be 2 Grubs immediately below the web you break through. Drop through two more webs, there will be 4 Grubs below the last web. They may not all die when you bust through, check your Grub counter. You may have to shoot them from the water if you miss any.

Grub #247-248: In the water, you can find 2 Grubs on a large stalagmite in the center of the room.

Grub #249-256: Swim through the underwater passage into the next side of the room. There are 2 Grubs on the ceiling of a small alcove off your right. Behind some Barnacles will be 3 Grubs with 1 Grub a little higher up above them. Now swim along over to the exit. There are 2 Grubs on the ground right in front of you.

Grub #257-259: Enter a yellow & bloody tunnel to leave. There is 1 Grub in your way upon entering. At the beginning of the first yellow tunnel, on the floor. Another 1 Grub will be in your way as you continue. Round a corner from here & 1 Grub will be on the wall right in your face.

Grub #260-263: Drop down into a new tunnel & you can go left or right. It is a big circle, take the path to the right. You will see another yellow tunnel off your left if you take this path. Inside, there is 1 Grub on the wall near the entrance & 3 Grubs at the back of the cave.

Grub #264-270: Flee from the Guardian & it will chase you into another yellow tunnel. There are 2 Grubs right in the entrance which you will probably crush when you enter. There are 3 Grubs a little bit further inside. Drop down & crush 1 Grub. There will be 1 more Grub hanging off the wall to the left before a web.

Grub #271-278: Exit the tunnel & find 2 Grubs hanging on the wall above it. Run down the tunnel & there are 2 Grubs on the wall above the next passage to your left. A bit further in there will be 1 Grub on the ground. 3 Grubs can be found just before a drop in the passage.

Grub #279-286: Drop down in the yellow passage & there are 3 Grubs immediately on the ground. 3 more Grubs are at the narrowing of the passage. We can find 2 Grubs just on the outside just above the exit to this passage.

Grub #287-292: Run to the right to get to the next passage. There are 3 Grubs found outside the entrance. There are another 3 Grubs shortly inside.

Grub #293-295: Drop down in this next yellow tunnel. There will be 1 Grub just before a web blocking our way. There are 2 Grubs on the outside of the tunnel exit again.

Grub #296-300: Leave the tunnel & bait the Guardian around the circle. We need to run through the tunnel he is protecting. Run down the tunnel & there is another 2 Grubs on the outside of the next passage on the left. At the back of this cave is 3 Grubs.

Grub #301-311: Leave the cave & drop down. Turn right & head to another yellow tunnel. There are 3 Grubs just outside it. There are another 3 Grubs inside the tunnel. There is another 3 Grubs further into this tunnel before a web locking your way. Lastly, there will be 2 Grubs on the outside of the exit.

Grub #312-315: Run down the tunnel & drop down into a mine passage. We will enter a huge chamber next. Look right from where we enter to find 3 Grubs along the wall. Turn back to look where we entered, along the wall left of us is a Web Cache. There is 1 Grub behind it.

Web Cache #6: Found just to the right of where we enter the huge chamber.

Grub #316: Follow the walls along the right of the chamber. There will be another Web Cache with 1 Grub in front of it.

Web Cache #7: Along the right wall of the huge chamber behind a metal vat.

Grub #317-322: From the Web Cache, keep going right along the wall. There will be 3 Grubs on the ground in your way. From here, look across from you to see a Barnacle hanging down in between some wooden platforms. Look up at it, & there will be 2 Grubs around a Web Cache in the ceiling. There is another 1 Grub behind this Web Cache.

Web Cache #8: Look up from the Barnacle in the far-right corner of the huge chamber. The Cache is in the ceiling.

Grub #323-328: Head across the room towards the elevator. On the other side of it we can find 3 Grubs along the back wall. Now head back towards where we entered the chamber where the other Barnacle is. Look up, & there is 2 Grubs outside the final Web Cache in the ceiling. There will be 1 Grub behind Web Cache #9.


Achievement #7 – Pinata Party: Find & break all 9 Web Caches in Episode 2.
After destroying Web Cache #9, the Achievement will unlock.

1. Complete Vortal Coil (Part 3), Freeman Pontifex, & Riding Shotgun
2. Antlion Grubs: 333/333
3. Achievements: 13/23
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Grub #329-332: Activate the elevator to let the Vortigaunt down. Follow him down the tunnel & we can find 1 Grub beside the generator he powers. On the other side of the door he opens, there is a group of 3 Grubs.

Return the Antlion Super-Goop to Alyx & revive her. After you catch up, you will be able to take the central elevator up to start leaving this cavern system & end this long Chapter. Before you go: grab Gnome Chomsky!

Grub #333: Take the elevator up with your companions & begin walking down the path till you see a lightbulb in front of you. Look right from the light through a boarded-up section of wall, the 1 final Grub will be on a wall on the other side.


Achievement #8 – Get Some Grub: Squish all 333 Antlion Grubs in Episode 2.
Wow, what a long Achievement… & we are still only on Chapter 2! I would love to say it is smooth sailing from here, but unfortunately, things will soon get much more complicated.



Achievement #9 – Twofer: Defeat both Antlion Guards outside the White Forest.
Story Related. Leave the mines & run across the valley past the Antlions. Eventually that Antlion Guardian will bust out of another entrance to the mine, & an Antlion Guard will soon crawl out of the ground afterwards. Flee to an Antlion Repellant Generator & unload all your ammo into them until they die. When the last one falls the Achievement will unlock.

There are no other Achievements for this Chapter, bring Chomsky everywhere with you. It is tempting to leave him with Alyx & the Vortigaunt when you guys split up later but we will not be able to grab him easily unless you place directly beside the door to Alyx's left. You will open this door & they will walk out; you will only have a few seconds to grab him before the door closes. If you leave him, be sure to make a Save before carrying on into the Chapter & a second Save before using the switch to open the door. If you place beside that door, use the switch then quickly run up the stairs & pull Chomsky in with the Gravity Gun. If you place him too far away, you may not have enough to get him before the door closes.

If you decide to take the Gnome with you, when it comes to driving the car off the jumps across the bridge, launch Chomsky ahead wit the Gravity Gun. He is guaranteed to fly out of the car if you take the jumps with him making this part a bit of a nightmare.


Now this is the annoying part, we have to drive through this Chapter while trying to keep Gnome Chomsky with us. I have tried a variety of different methods, the easiest just seems to be driving slow with him inside the car between you & Alyx. Be sure to check where he is, a lot. If you drive even a smidge too fast, he will just fall off the car, no matter where you cram him. Save often! If you are on keyboard, instead of holding accelerate, just spam the “W” button & gain speed that way.

moτanu suggests that if you place Chomsky laying flat in the middle of where your rear window is supposed to be with his head pointing towards the front of the car, he has an easier time staying put. He still might fall out, but it could theoretically happen a lot less than if you just have him bouncing around in the cab. Definitely try this strategy out!

At the same time we are taxiing Chomsky & Alyx around, we also have to try & get 20 kills by running enemies over in the car. If a good opportunity arises, smash the guy, but always make sure you collect Chomsky again afterwards.


Achievement #10 – Payback: Kill a Hunter with its own flechettes.
After turning on the power to the radio station you will be attacked by 5 Hunters. The Hunters will fire flechettes that will stick to whatever they are shot at before exploding. With the Gravity Gun, pick up a medium sized object like tires, wheelbarrows, barrels, etc. Block the flechettes with the object then fire it back at the Hunter. It may take a few tries but if you can kill one this way with the explosion you will unlock the Achievement.


Achievement #11 – Meet the Hunters: Survive the Hunters ambush with Alyx.
Story Related. Defeat all the Hunters during the ambush at the outpost to unlock the Achievement.


Achievement #12 – Hot Potat0wned: Kill a Combine soldier with his own grenade.
After driving off the Advisor, the barn you are in will be stormed by Combine. This is a good time to try for this Achievement. Kill the first three soldiers then head down the hall from where you grab the Crossbow & save.

Walk about halfway down the next hall towards the outside to trigger the next set of soldiers then run back through the door you left. Wait for Alyx to get behind you so she doesn’t kill them, then watch the soldiers run towards you. Ideally the Shotgun Combine will throw a grenade. Grab it with the Gravity Gun & kill him with it to unlock the Achievement. If the quarters are too tight & you keep shooting the grenade past him, grab it with the Gun & charge him while holding it. Killing him this way also counts. This may take quite a few tries getting him to throw the grenade.

When you get to the part where the Hunter-Chopper is chasing you in the car, I found it was easiest to launch Chomsky ahead with the Gravity Gun, drive up with the car, then launch him further. Either way, you’ll be shot getting out of the car to grab him & put him in the car or to launch him. I found it was impossible to keep him in the car during this part. Save often.


Achievement #13 – Puttin’ On A Clinic: Defeat the Hunter-Chopper in Episode 2 without any misses.
Eventually, after running from the Hunter-Chopper & painstakingly taking Gnome Chomsky with you, you will smash through a Lambda gate & break the car. From here, we will fight the Hunter-Chopper with some Resistance fighters. Stash Chomsky somewhere safe. Save.

The Chopper will drop mines at us, we must grab them with the Gravity Gun & launch them back at the Chopper three times to destroy it. We cannot miss a throw, however. Every time you successfully hit it, quick save. You will have to reload the game every time you miss or don’t follow through with a throw.

1. Complete Under the Radar
2. Radar Caches: 5/5
3. Achievements: 19/23
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Achievement #14 – Gunishment!: Destroy the Combine Autogun in the scrapyard.
Story Related. While you are waiting for some Resistance members to repair your car, they will task you with taking down an Autogun in a scrapyard. After blowing up its core with grenades you will unlock the Achievement. You can leave Chomsky back where they fix up the car, just do not leave him on the empty table in the garage. When you return, the table will be deleted & the car will be there instead.

If you still are struggling to unlock the Hot PotatOwned Achievement, EckyThump discovered a good location for it in this area before destroying the Autogun. See below:

EckyThump: "In the Combine Autogun encounter, after crawling through a pipe, you can crouch walk across a row of cars towards a building that contains a pair of Combine soldiers. You can stand up by the side of the cab of the blue truck closest to the building wall. The Autogun can't hit you, the soldiers can't see you, & it's a good place to Quick Save. Use the Gravity Gun to break the building window with a crate, & the soldier at the back will almost always toss a Grenade out. You might have to let him see you first so it's really easy to grab it with the Gravity Gun & toss it back inside. There are two soldiers there with nowhere to run, it's almost a guaranteed kill."


Achievement #15 – Hit & Run: Run over 20 enemies with the car in Episode 2.
When you destroy the Autogun, there will be a whole host of Zombies outside. Run past them on & get in your car, this is a perfect opportunity to rack up some car kills. If managed to get a bunch of kills in the last Chapter you may unlock this here. Otherwise, keep your eye out for easy targets throughout this Chapter.

Don’t leave without Gnome Chomsky!

Radar Cache #1: Take your car out of the scrapyard. When you leave the toxic pools Alyx will mention something on the radar. Check it, & there will be a yellow Lambda symbol on it. Around the corner to the right of the pool will be a van that has explosive barrels around it. Blow up the barrels & you can raid the first Radar Cache.

Radar Cache #2: Drive along past a large water tower & carry on down the road. You will pick up a Radar signal coming from a warehouse on your left that has a white van lodged in a wall around the back. Crawl through the van to get into the building. There will be a large metal plate inside, bring it down with your Gravity Gun. Now, throw a grenade underneath it & stand on top of it. The explosion will launch you onto the walkway above, flip the switch to unlock a fence gate & raid the Cache.


Achievement #16 – Gordon Propelled Rocket: Unlock the Rocket Launcher Lambda Cache in Chapter Under the Radar.
This will unlock at the same time as when you flip the switch for Radar Cache #2, they are the same Cache.

Radar Cache #3: Leave the warehouse & walk across the street into the fenced area with all the C-Cans. At the back will be a small shed that has a hole in the roof. Enter, & there will be a sawblade stuck into the floor. Grab it with the Gravity Gun & it will reveal the Cache underneath.

Radar Cache #4: Drive through the tunnel up next & follow the road up a hill to the left. Head up the switchback & stop when you have a fallen tree off your left beside the road & a rock wall to your right. Head around the tree towards a rock wall to find a small hole in it. Crawl through & blast some small rocks out of your path. The Cache is just in the back of this small cave.


Achievement #17 – Quiet Mountain Getaway: Survive the ambush at White Forest Inn.
Story Related. As you drive, we will eventually be trapped behind a Combine laser field at the White Forest Inn. Fight your way through the waves of Combine & finish off the ambush force to unlock the Achievement.

Gnome Check! Do you have Gnome Chomsky with you?

Radar Cache #5: Leave the White Forest Inn & take the jump down below. Drive the switchbacks down past a flaming car & around until you get another signal from the final Cache. Head around some rocks & you will see an arrow pointing up at a crate hanging from a tree. Use a rock with the Gravity Gun & knock the crates down. Looting them will get you the Cache.


Achievement #18 – Cache Checker: Find all 5 Radar Caches in Chapter Under the Radar.
Upon raiding the fifth Cache, the Achievement will unlock.


Achievement #19 – Pedal to the Metal: Beat D.O.G. in a race to the White Forest base.
When you link up with D.O.G. Alyx will challenge you two to race to the White Forest base. Save.

There is no way we can keep Gnome Chomsky in the car with us & beat D.O.G. We will beat him, then reload our save & drive to the base with Chomsky much slower. As soon as Alyx says step on it, do just that! It is a short distance, head down the river then up the path on your right. Around the corner then you are pretty much there. Alyx will say “Better luck next time, Slow-Poke.” If we were successful. Now reload the save…. & unfortunately lose (unless of course the Gnome Gods smile upon you & he stays in the car for the race).

1. Complete Our Mutual Friend, & T-Minus One
2. Little Rocket Man
4. Achievements: 23/23
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Achievement #20 – Little Rocket Man: Send the garden Gnome into space.
When you take the elevator down to Silo 1 with Eli & Alyx, you will at long last find our Rocket. Dr. Kleiner will step down some stairs, walk up them to the open hatch. Place Gnome Chomsky inside & close the hatch. Make sure you close that hatch; just placing him inside the rocket & walking away will not unlock the Achievement! After the hatch closes, we will have at long last unlocked the Little Rocket Man Achievement. Get in there you little (censored by Steam).


Achievement #21 – Secondary Silo Secured: Secure the launch doors on missile Silo 2.
Story Related. After fighting your way through Silo 2 & fight the Combine off with the gun turret you will unlock the Achievement when the silo doors close.


Achievement #22 – Neighborhood Watch: Save all buildings outside the missile silo from destruction.
This is a very tricky Achievement. As it states, we cannot let any Striders destroy a single building. Save after every time you kill a Strider. If that is not hard enough, they will be escorted by 2-3 Hunters. Launching logs are gunning them down with the RPG, Crossbow, Revolver, or Pulse Rifle are your best options. Keep lots of saves in case you quick save at a bad time & cannot make it to an area in time. There are 13 Striders total, be quick. While some are slow there are a few that sprint to buildings to destroy them.

This Is Madness! Has a great breakdown of this Achievement with maps & everything. If you are having issues, check this guide out.

https://steamproxy.net/sharedfiles/filedetails/?id=171147837

When the last Strider is destroyed, you will here the Resistance celebrate & the Achievement will unlock.


Achievement #23 – Defense of the Armament: Save the missile silo from the Combine offensive.
Story Related. After defending White Forest from the Strider invasion force you will unlock the final Achievement of the game.


There are no Achievements found in this Chapter.

A very tedious 100%, if you made it this far, congratulations. If it wasn’t for the Grubs & Gnome Chomsky this probably would have taken you less than 3 hours to complete instead of the 10 it took me. A great end for the series however leaving you with one singular question… Why isn’t there a Half Life 3?! If this guide helped you achieve 100%, rate the guide or let me know in the comments. Helps me know if I am doing things right!



100% Complete!
Thank you for choosing Cynic, & I will see you in the next guide!

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