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XT-002 Deconstructor is one of three bosses you can choose to engage
after defeating Flame Leviathan.  Deconstructor has 5
different achievements, 10 total including heroic difficulty.

Must Deconstruct
Faster

The key to Must Deconstruct Faster is to apply as much damage to the
heart at 75, 50, and 25% as possible without killing them. 
This way when the heart goes back into Deconstructor he should be ready
to drop his heart again.  The reason this speeds up the fight
so much is due to the fact that there will be little to no tantrums and
very few adds which allows all your DPS to simply Deconstruct the
Deconstructor.  Since the strategy for this achievement is
basically what you should be doing just to kill him, this achievement
should come on its own.

Nerf Engineering

If your raid tanks him between the scrap piles to the east or west,
this achievement becomes extremely simple.  When you tank him
between the scrap piles on the sides of the room it forces all the
Scrap Bots and Bomb Bots to spawn from the 2 piles on the far side of
the room making it very easy to kill the adds before the reach
Deconstructor.

Nerf Gravity Bombs

If there had to be an explanation for this in one sentence it would be
“Don’t be an idiot!”  Simply run
away from the group when you receive the purple glow from the Gravity
Bomb.  This has nothing to do with healing if your players can
react quick enough, though, if everyone is topped off you cannot be
killed in one shot from the Gravity Bomb.

Nerf Scrapbots

This achievement takes a bit of luck.  Since the bots run
directly to Deconstructor and become consumed, you would either have to
play around with kiting or get lucky with the number of Scrapbots you
get to spawn.  Try using AoE slowing effects to group them up
as much as possible, then kill the Boombot and watch the die.

Heartbreaker

This achievement requires some top end single target DPS. 
When the first heart drops at 75% your raid must blow every cooldown
possible and kill the heart before it goes back in.  Once that
is done, Deconstructors health will go back to full.  From
here, the fight is completely different.-When the Gravity Bomb wears
off it will also leave a void zone on the ground.

• When the Light Bomb wears off, it will spawn a spark that
  must be tanked and killed as fast as possible.
• There will be no additional adds.
• The heart will no longer fall out at 75, 50, and 25%.
• The hard part is organization of the Light/Gravity Bombs
  and beating the enrage timer.