Halo: The Master Chief Collection

Halo: The Master Chief Collection Achievements

Rock and Coil Hit Back

Halo 2A MP: In Anniversary matchmaking, earn a total of 100 Environmentalist medals.  

This Multiplayer medal is represented by a black skull inside a yellow triangle and is only available in Halo 2: Anniversary. It is awarded to players upon killing an opponent with any dynamic element in the level. This includes - and is unfortunately limited to - the stalactites in Lockdown, as well as the fusion coil barrels in both Lockdown and Stonetown. As a final reminder, this achievement will take quite a while to earn as there is no definitive way to boost Environmentalist medals.

Since there are only two maps that allow players to receive these medals, you're best bet when playing Multiplayer is to stick to the following playlists: Halo Championship Series or Team SWAT. Lockdown will appear in both playlists (more commonly in HCS). Stonetown on the other hand will appear in Team Halo 2: Anniversary, Halo 2: anniversary Rumble, Team Slayer, and Big Team Battle. Despite this, Team Slayer and Big Team Battle are not recommended because Stonetown has a very low probability of appearing as one of the maps. It has a greater chance of appearing in Team Halo 2: Anniversary and Halo 2: Anniversary Rumble, however Stonetown doesn't have as many fusion coils as Lockdown.

With this in mind, stick to the Halo Championship Series playlist or the Team SWAT playlist. Environmentalist kills are not always guaranteed every match, however if you're keen on shooting down the stalactites every so often during a match - or happen to shoot a fusion coil while an opponent is camping near the "Sniper Tower" or above the "BR Tower" - you may be lucky enough to earn yourself an Environmentalist medal if these objects kill the enemy player.

All in all, this achievement goes only as far as a player's luck and skill in luring enemies into these environmental trap, so you'll need to dedicate a decent amount of time to Lockdown in order to get this done. Once you achieve 100 Environmentalist medals, this achievement will unlock.

Rate this achievementAverage Rating (Based on 1 votes)
User Comments
Comment #1 by VanillaRAOS
Thursday, April 02, 2015 @ 08:54:53 PM

If anyone wants to boost this my GT is VanillaRAOS. I have one extra controller. Might be easier now that they have team doubles.

Comment #2 by Pake
Wednesday, April 15, 2015 @ 08:39:05 PM

wow this achievement is so bs

Comment #3 by TW Cantor v2
Sunday, May 10, 2015 @ 08:49:31 PM

Online now to boost this, GT is TW Cantor v2

Comment #4 by xArmageddon7x
Thursday, June 11, 2015 @ 09:19:00 PM

If anyone knows how to boost this, I'd love to either know or help. Message my GT.

Comment #5 by The Caff
Thursday, June 25, 2015 @ 02:47:48 AM

Hi guys would anyone like to boost this and the Domination achievement? I only have one controller. Send me a message if you're keen! GT: SigmaDeluxe

Comment #6 by rdgrill12
Sunday, August 30, 2015 @ 05:37:06 PM

This achievement will take forever if people keep avoiding Lockdown while voting. Message me on XBL if you're interested in trying to boost this and other multiplayer achievements. GT: RDGrill12

Comment #7 by Viscousbauer 24
Monday, September 14, 2015 @ 10:25:45 PM

Looking to boost this no body seems to want to play on the map have 2 controllers message me if interested gt viscousbauer 24

Comment #8 by infernoterrorize
Wednesday, September 16, 2015 @ 05:54:51 AM

How does one boost this?

Comment #9 by Blackendo1
Friday, October 02, 2015 @ 07:01:21 AM

I would gladly help anyone boost as I need this too. BlackendO1

Comment #10 by Endridi
Saturday, November 07, 2015 @ 02:20:01 PM

I am available to help boost this after 4pm EST time. I have 2 controllers, so we just need 6 more to fill up an action sack party. My gamertag is Endridi

Comment #11 by Randepic
Sunday, January 03, 2016 @ 07:47:18 PM

I'm looking to boost this achievement as well as Domination, Double Trouble, Spree Master, Catch This, Party Pooper, Planting a Flag, The True King, and Roadkill Rampage. I have four controllers and so will need others with multiple controllers or just more people. Message on Xbox Live if interested. GT: epicallyAwEsOmE. Would like to get these ASAP!

Comment #12 by Hawk0501
Thursday, January 14, 2016 @ 01:24:44 PM

Looking to boost this cheevo along with others as well as donmination, the true king, and the environmentalist. I have 3 controllers, message me if you would like to do it, GT TLW hawk.

Comment #13 by Cody100100100
Sunday, January 31, 2016 @ 04:49:36 PM

Looking to boost this achievement along with the following achievements:

Roadkill Rampage
Shields Up!

I can boost with someone for the following, since I also need these (though I can get these easily if no one wants to do it)
Flaming Ninja Anniversary
Legend Slayer
Ninja Redux

I have 4 controllers, but prefer using 3 due to my 4th one being a pain to set up, but if needed I'll pull it out.

My GT is Cody100.

Comment #14 by desolatedoom
Tuesday, February 16, 2016 @ 05:01:33 AM

So I'm guessing you can't do this one in custom games?

Comment #15 by NightFalcon1O1
Wednesday, April 27, 2016 @ 11:14:55 PM

looking for another player with 4 controllers to get this. gt : NightFalcon1O1

Comment #16 by wolf12311
Sunday, July 24, 2016 @ 09:39:05 PM

looking for players to boost this I have 3 controllers my gamer tag is robbots12311 just send me a message on live

Comment #17 by Broey Broe
Wednesday, August 10, 2016 @ 07:39:08 PM

Looking to boost this with people too, I have 2 controllers and my GT is below, send me a friend request if you would like to help boost this :)

GT: Broey Broe

Comment #18 by KimiHeBaStTSBS
Sunday, August 14, 2016 @ 05:38:39 PM

Anyone add me to boost this and the other multiplayer medal achievements

Comment #19 by SS SPARTAN 117
Wednesday, September 07, 2016 @ 05:02:35 AM

Got 3 controllers...gamertag is
Looking to boost most matchmaking only MP achievements.

Comment #20 by GhostGhidorah
Saturday, September 24, 2016 @ 07:08:15 AM

Looking to boost this and Domination. Gamertag is GhostGhidorah, just message for an invite.

Comment #21 by mcnick29
Thursday, November 10, 2016 @ 11:23:46 PM

Anyone looking to boost this or other achievements, message me on xbox. My GT is the same as my username.

Comment #22 by tomthefly
Wednesday, March 01, 2017 @ 09:51:18 AM

Need Help with this.I got 4 controllers :) Send me a message GT: tomthefly

Comment #23 by Kiaeneto
Thursday, March 09, 2017 @ 03:38:06 AM

CO-OP Achievments:

Mind the Gap

Multiplayer Achievements:

Party Pooper
Planting A Flag
The True King
Roadkill Rampage
Rock and Coil Hit Back

My gamertag is iL Kiaeneto Li

Comment #24 by LegendaryGoetz
Wednesday, September 19, 2018 @ 11:27:16 PM

GAMERTAG: LegendaryGoetz

I have 4 controllers and am willing to do what ever it takes to unlock these achievements

Looking to get:
- Roadkill Rampage
- Rock and Coil Hitback
- Annual
- Deja Vu

Comment #25 by Khagda
Tuesday, July 30, 2019 @ 12:01:50 AM

Looking to Boost this achievement and others this Saturday, message me if interested. GAMERTAG: khagda

Comment #26 by Shadowkira13
Thursday, August 22, 2019 @ 03:48:38 PM

Looking to boost the following achievements:

Rock and Coil Hit Back
Party Pooper
Catch This.

Already 60+% done them but looking to speed up the progress. I have 4 controllers. Message me. GT: Shadowkira13

Comment #27 by kevinjr
Wednesday, November 13, 2019 @ 01:12:26 AM

Looking to boost this and other matchmade achievements willing to help also
GT: Gladiator291

Comment #28 by shouty33
Monday, December 23, 2019 @ 11:06:57 AM

Looking to boost these achievements and also the coop campaign ones if we gotta get those also GT is shouty33

Comment #29 by xMassacr3 27x
Tuesday, December 31, 2019 @ 11:23:15 PM

Looking to boost this achievement just message me when is a good time.
GT is xMassacr3 27x

Comment #30 by shouty33
Wednesday, January 01, 2020 @ 09:13:27 PM

Looking to boost this whenever GT is shouty33

Comment #31 by exodus1811
Friday, May 22, 2020 @ 04:32:25 PM

Looking for boost. Message me/ Add me for boosting SupraKing1

Comment #32 by DashAcinaces
Sunday, June 07, 2020 @ 08:41:44 AM

Hey - four controllers available to boost this where possible, along with 100 Splatter medals. GT is same username here.

Comment #33 by EazyFaDe
Monday, June 22, 2020 @ 05:26:40 PM

Hey. I got two controllers available to boost this where possible. GT is same username here.

Comment #34 by CrAzY SicK
Tuesday, June 23, 2020 @ 02:09:15 PM

Looking to boost this I have 2 controllers. Send me a msg my GT: CrAzY SicK

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Game Info
343 Industries


US November 11, 2014

HDD Space Required : 45.63 GB
Price: $59.99USD
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User Score is based on 368 user ratings.