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Heartbreaker
Defeat XT-002 Deconstructor in Ulduar after destroying his heart.
Heartbreaker is a 10-point achievement earned by defeating XT-002 Deconstructor in Ulduar after destroying his heart during the heart phase.
Reduce Your Damage Output
Before engaging XT-002, strip off all your gear and equip a low-level or grey weapon, or use 
Whole-Body Shrinka' to reduce your damage by 99% for 3 minutes — alternatively, 
Mecha-Blast Rocket can also be used to safely manage your damage at max level with gear on.
Auto-Attack Boss to 75%
Slowly auto-attack XT-002 down to 75% health to trigger the heart phase, keeping his health as close to 75% as possible since damage dealt to the heart also transfers to the boss — if his health drops too low before the heart dies, the attempt will fail.
Destroy the Heart Immediately
Once the heart appears, burn it down quickly during the first heart phase; if the heart is not killed in this first phase, XT-002's health will be too low in subsequent heart phases (triggered at 50% and 25%) to complete the achievement.
Kill XT-002 Normally
After the heart is destroyed, XT-002 returns to full health — re-equip your gear if needed and kill him normally to complete the achievement.