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Power Up

Attach an upgrade to a turret.

Power Up0
1 guideOffline Game ModeSingle PlayerCooperativeVersusShopPartly Discontinued/Unobtainable
VirusTk GaMBitVirusTk GaMBit857,687
20 Oct 2015
1 0 0
Very easy and unmissable achievement.
You can do this in any level and with every turret. However, I recommend using the tutorial for this achievement.
You will get this as a normal progression as early as you start playing the tutorial. In the tutorial you will be told to upgrade your turrets. Do so and the achievement will be yours.

The video below can be used just in case. It will also provide a solution to the boom achievement.

(video credit: Niteowl1980)

Hope this helps!
Any improvements? Please let me know in the comments below!