Must Deconstruct Faster (10 player)

Kill XT-002 Deconstructor in less then 3 minutes and 25 seconds. For comparison: his enrage timer is 7 minutes, so the raid will have to do 105% more DPS when compared to a kill close to the enrage timer.

The key to doing this achievement is to go all out in the heart-phases. He takes twice as much damage and if you nuke enough, he will barely spend any time between heart-phases. As soon as he does the emote "So tired, i'll rest for just a moment", the heart will pop up, but there's still 5 seconds or so to DPS the boss. Make the most of this time to burn him down even more and to reapply DoTs (they keep ticking during the heart-phase). Make sure Bloodlust is up for the first heartphase.

Tonight my (25man-geared) raidgroup popped Bloodlust on the first heart-phase, and we had to stop DPS to prevent it from going to hardmode. When the XT-002 popped back up, it had dropped to 38% HP. 5 seconds or so later, he emoted for the 2nd heart-phase. With adds now coming from the corners, DPS on the heart was less, but we still managed to get the XT-002 back at only 20% HP, below the 25% marker for the 3rd heart-phase, so after about 5 seconds it popped into that phase. Once that heart-phase ended, he died giving us the achievement.

The main focus is to make sure to DPS him down far enough during the first heart-phase (both the period directly after the emote and the actual heart-DPS) that in every following heart-phase, you can get him to below the next 25%-marker right when he pops back up.

This isn't as hard as it sounds. My group is Ulduar10/Naxx10 geared with a few pieces of T7,5 but we killed him in 165 seconds on our last try. Simply pop all cooldowns + heroism on the first heartphase (we almost initiated the hard-mode by accident) and simply keep dpsing him. He should start his 2nd hart-phase right after coming out of his 1st.
The key is to tank near the left or right wall. That way adds will only spawn from the two heaps of scrap at the other end of the area. By the time he went down the first wave had only made it about 2/3 across the room and was well out of range of the Deconstructor, effectivly allowing you to ignore them alltogether. Only make sure to misdirect the elite bots onto the tank or have your healers stand close enough for the tank to taunt them off, as they will run faster than the scrap/bomb-bots.