Mass Effect 2

Mass Effect 2

59 Achievements

62-84h

PS3
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Big Game Hunter

Big Game Hunter

Thresher Maw defeated

51.8%

How to unlock the Big Game Hunter achievement in Mass Effect 2 - Definitive Guide

Edit: I'm bored and going though some solutions. This one was pretty outdated and needed a revision, so on the dawn of Mass Effect 3 I present the newer solution.

So, the Thresher Maw was a pretty intimidating enemy in the first game, randomly appearing on uncharted worlds; making short work of the Mako. Not anymore, though.

There is only one Thresher Maw and you shall be fighting it on foot. You will encounter it by doing Grunt's loyalty mission (note: If you do not release him from his tank, this achievement cannot be unlocked. I am unsure if releasing him after going through the Omega-4 Relay will still allow you to access his loyalty mission or not).

Fighting it on foot is pretty easy, depending on the difficulty you are playing on. You are given 5 minutes to "survive" it, but it should take less than half of that amount of time to kill it. It is you, Grunt, and one character of your choosing. It's health bar is strictly Armor (even on Insanity). The following weapons and skills will prove useful:
-Almost any heavy weapon, Heavy Pistols, Sniper Rifles, some Assault Rifles
-Incendiary Ammo (Vanguards, Soldiers, Grunt, Jacob)
-Warp (Adepts, Sentinels, Thane, Miranda)
-Inferno Grenade (Zaeed's loyalty power)
-Warp Ammo (Jack's loyalty power)
-Armor-Piercing Ammo (Garrus' loyalty power)
-Incinerate (Engineers, Infiltrators, Mordin)
-Reave (Samara's loyalty power)

The Thresher Maw doesn't require any super-crazy tactics. It will shoot the lovely acidic saliva at you causing a fair amount of damage to you. You can use the pillars littered throughout the battlefield for cover, but they can be destroyed by the Thresher Maw. It never gets close enough to attack you with melee strikes, but it will circle around the arena.

The fight isn't very difficult (especially on Normal or Casual), so this is an easy 10 gamerscore
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5 Comments
i just got this last night, i used grunt (mandatory) & garrus (loyal) his armor piercing round wouldn't work against the thresher maw (it wouldn't highlight, it was "greyed out") but i still happened to kill the creature
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By xenon ghost on 11 Feb 2010 19:59
Yea, Tuchanka and the Grun't Mission is the situation Rooster Teeth is using for their Achievement Guide aswell.
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By Azoonux on 24 May 2010 23:12
Grunt mission is the only time you fight a thresher maw.
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By Solario32 on 02 Nov 2011 12:35
Seeing as how going through the Omega 4 Relay is the point of no return, I'm guessing it's NOT available afterwards.
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By o Berserkr on 19 May 2013 19:08
You can do anything you want after the suicide mission, and carry that save into 3 as well.

Guide should add that the Cain will take off half the Maw's armor bar, making short work of it.
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By BloodngunsMrphy on 17 Jun 2014 19:36
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During the third step of the Krogan Rite of Passage (Grunt's loyalty mission), you have to survive a thresher maw attacking you for 5 minutes. You get this achievement for killing it within that 5 minutes. It is easy if you just watch where the thresher maw pops out of the ground, and use the 3 columns that can't be destroyed for cover while corner shotting. It only has shields, no health, so once you wipe those out, it is dead.

I did this with Grunt and Morlin using nothing but assault rifles and submachine guns and it took me 4 minutes on Insanity.
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29 Jan 2010 14:08

3 Comments
Playing on normal with an Infiltrator, I managed this in something like 30 seconds. I was using the Widow Anti-Material Rifle and I dropped the Thresher Maw with around 8 shots. This was much faster than using the Collector Beam heavy weapon.
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By m0rph3us17 on 03 Feb 2010 19:19
I also completed this with submachine guns, i did however unlock grunts incendiary rounds for the whole party. The submachine gun was great because there is no penalty to movement whilst using it.
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By DrHarris on 11 Feb 2010 16:22
Adept, Grunt & Miranda, Incendiary-Round SMGs and a buckload of Heavy Warp, took me 90 seconds or so.
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By Zombie Deej on 10 Mar 2010 20:31
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When fighting it in the "Rite of passage" loyalty mission - have miranda as your other party member. Have her use her "warp" ability to bring down the armour quickly and for Shepard - use the particle beam weapon. This took me 30-40 seconds.
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30 Jan 2010 16:50

You'll encounter a thresher maw during Grunt's loyalty mission. During Grunt's trial, one objective you'll have is to survive a thresher maw attack for five minutes. Use any heavy weapon that you have. I used the collector particle beam and took it down within a minute, but any heavy weapon will do the job. Remember, you are working on a timer here. If you don't kill the thresher maw within five minutes, you'll have to restart the game or reload your save. Make an extra save before beginning the trials.

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This is missable. On the third part of Grunt’s loyalty mission, you’ll be asked to survive a thresher maw attack for 5 minutes. You must kill it within the timeframe to unlock the achievement. It only has an armor bar, so use heavy weapons and anti-armor powers.

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(Missable) You'll encounter a thresher maw during Grunt's loyalty mission. During Grunt's trial, one objective you'll have is to survive a thresher maw attack for five minutes. Use any heavy weapon that you have. I used the collector particle beam and took it down within a minute, but any heavy weapon will do the job. Remember, you are working on a timer here. If you don't kill the thresher maw within five minutes, you'll have to restart the game or reload your save. Make an extra save before beginning the trials.
 
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The lone Thresher Maw in Mass Effect 2 is faced in Grunt's loyalty mission "Grunt: Rite of Passage", after clearing the last wave of regular enemies, there will be a rumbling and the Thresher Maw will raise from the ground and you will have five minutes in which to defeat it.

The Thresher is a powerful and dangerous enemy especially on higher difficulties, but the strategy isn't too hard. The Thresher has a single Armor bar for both health and protection so ammo powers like Incendiary, Warp and Armor Piercing ammo are recommended if your Shepard or your other Squadmate has access to. Any other power that is effective against armor like incinerate, warp, reave and others also work very well in dealing large amounts of damage, any kind of Heavy Weapon can also quickly rack up damage as well.

Since Grunt is required for this mission, make sure he has incendiary ammo turned on, even though the power wheel will show it as ineffective, Concussive shot does stagger the Thresher and prevents it from launching as many acid barrages at once. Garrus Zaeed and Solider Shepard can use this strategy too if present to chain stagger the Thresher to help avoid damage.

Shooting the blue tendrils near the Threshers mouth deals significantly more damage than the rest of its body, but these tendrils are somewhat difficult to hit.

As long as you keep a good amount of pressure on the target you should defeat it with over a minute remaining even on Insanity difficulty.
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02 May 2016 22:48

This is missable. On the third part of Grunt’s loyalty mission, you’ll be asked to survive a thresher maw attack for 5 minutes. You must kill it within the timeframe to unlock the achievement. It only has an armor bar, so use heavy weapons and anti-armor powers.

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During Grant's personal quest for his initiation, a Thresher and a time counter will appear at the last stage of the ritual. You can simply hold out for the allotted time, or you can defeat him to get a trophy. He has no life bar, only an armor bar. Use a grenade launcher, as well as a skill that gives you armor-piercing or incendiary rounds, they deal more damage to armored opponents. Within a couple of minutes, the Thresher will be defeated.
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13 Jan 2011 13:40

1 Comment
There are indestructible columns in the location. You run around it, taking cover from the Thresher's attacks. Along the way, you shoot at him from heavy weapons, and then from a machine gun (passed as a Soldier), simultaneously spamming your fellow party members with songs (he took Miranda, she takes off the normal armor). I killed it without any problems on the first try, I still had a minute left.
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By den17g on 25 Aug 2021 11:21
I don’t advise you to wait 5 minutes. It’s long and dangerous. Take the Collector’s cannon that shoots a beam. Run up to the cover, which you can approach from 3 sides (to dive), it won’t be demolished and just shoot. This way the enemy won’t hit you and you will always deal damage from cover
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20 Nov 2011 13:13