This achievement is not that hard to get but you will have to unlock a few things first before you can get it the easy way.
First what you will need to do is play the campaign and complete the prolog along with tournaments 1 - 5.
Once you complete tournament 5 you will unlock the playable character Mackenzie. This Robot comes pre-equipped with the Attack Harmony augment.
Once Mackenzie is unlocked, I selected tournament 1 because it was the easiest while also selecting to play as Mackenzie.
Find another bot to fight. You will need to get the two attack cells to 5. Normally this would give you 10 attack but with the Harmony Augment you now are attacking with 20.
Next you will need to find a boost augment with a power of 5.
After having all that just attack and your attack will have a value of 25 damage.
this will also grant you