Defense Grid 2

Defense Grid 2

65 Achievements

1,000

25-30h

Xbox One
Xbox Series
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Head Trauma

Head Trauma

Build 100 Concussion towers.

10

4.16%

How to unlock the Head Trauma achievement in Defense Grid 2 - Definitive Guide

You first unlock the Concussion Tower during level 05.
One of the easiest ways I have found grind these types of achievements (if its for a tower type you don't use) would be to play level 12 on Practice on Easy (I believe you can play any level at any time you want, feel free to correct me if I'm wrong.)
Even on Story Mode, you can essentially beat the level with just the 8 tower spots around the core housing, and maybe one tower blocking the quickest route.
I build 3 cannons along the side closest to the ship, a concussion on the single spot near this, a temporal on the spot across the road, and then at least one tesla among the other 3 spots.
When the level is nearing its end (1-2 waves left) just fill as many spaces as possible with the tower you are working on.
I was able to get at least 50 of the tower I was working on on any particular run (and that was on Story Mode - less resources)

You can do something similar on any level when you finish as long as you remember. This is just for if you are solely trying to grind out this achievement.

As with all other achievements in this game, this achievement will not unlock until you finish the level.
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01 Oct 2014 04:40

4 Comments
Just play on Easy and do some levels where you focus on using the non-favorite towers (temporal, tesla, concussion, inferno).
On final wave when you see that victory is imminent, build more towers, won't affect your highscore.
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By thomaskorat on 21 Dec 2014 09:16
^once you have that Gold Medal locked up, start buying whatever towers you use the least.
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By McGubbalo on 04 May 2016 20:58
It is pointless to worry about this achievement of you are going to get 100 gold. You will be making 100s of these towers throughout your play through.
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By Kanchanaburi on 12 Jul 2016 19:19
Guides don't need to be written from the perspective of what other achievements there are. There are plenty of reasons someone might want to grind out this achievement instead of getting it over time. This is one of the faster ways to get this achievement if you just want this achievement.

Yes, as concussion if the best AOE tower, you're probably going to build them a lot. That doesn't mean someone is going to want to wait to earn the achievement.

TL;DR - "That's just like, your opinion, man."
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By Elite1111111111 on 12 Jul 2016 19:56
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Don't bother grinding all those 'build 100 XXX towers', because on your way for the 'Master Strategist' achievement ('Earn 100 Gold Medals on any missions'), you'll get it.

Here's a YouTube playlist made by JogandoEAndando with videos on how to beat EVERY mission on EVERY mode on NORMAL difficulty. I've used it from A to Z to beat the game (50hrs) and each guide is perfect. Very nice work from him, congrats!

https://www.youtube.com/playlist?list=PLyx3ruPOCg3_g0ZCN_9in...
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17 Jul 2017 12:07

Concussion towers are unlocked straight midway through the game and deal damage by throwing explosives onto enemies. This trophy is cumulative, so just build 100 of these towers over the course of the game to obtain it. 

You will most likely obtain this trophy through natural play, but if you don’t you can get this fast and easy by playing missions in training mode. Build as many boost towers as you can right off the bat and just let the mission run out. You don’t actually have to win the mission for the towers to count. That trophy itself won’t pop until the mission is over.

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From the Tower Encyclopedia: The Concussion tower fires explosive grenades in all directions, decimating everything nearby. There is no better solution when enemies are concentrated in a large dense area, but it is not as effective against single strong aliens or shields.

This achievement requires that you build 100 Concussion towers across all of your games. Your particular playing style may mean that this unlocks naturally without any particular effort. However, if you don't tend to use Concussion towers, or simply want it to unlock more promptly, you can play Chapter 19 in Practice mode on easy and play only Concussion towers. You can easily place 100 towers on this map and unlock the achievement at the end of the game, win or lose.

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