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Strike!
Kill 18 Kor'kron Warbringers with a single Iron Star and then defeat Garrosh in Siege of Orgrimmar on Normal difficulty or higher.
Strike! is a 10-point achievement earned by killing 18 Kor'kron Warbringers with a single Iron Star and then defeating Garrosh in Siege of Orgrimmar on Normal difficulty or higher.
Track the Achievement
Before engaging Garrosh, put the Strike! achievement on tracking — when it turns white, the Iron Star kill condition has been met and you can proceed to kill Garrosh.
Position Near an Iron Star
Stand near one of the Iron Stars on the side of the room and kill the Siege Engineer that spawns next to it, preventing the Iron Star from firing prematurely.
Accumulate Warbringers
Each wave spawns 6 Kor'kron Warbringers plus a Farseer Wolf Rider — kill the Farseer Wolf Rider immediately to prevent healing, then continue killing the Siege Engineer to hold the Iron Star while more Warbringers accumulate until you have more than 18.
Soften Warbringers Below 50%
Use AoE abilities to reduce all accumulated Warbringers below 50% health without killing them — specs with a tap AoE (a single-hit low-damage burst) work best for this, such as Barrage for Marksmanship Hunters or Mass Entanglement combined with unequipping your weapon for Feral Druids.
Fire the Iron Star
Once more than 18 Warbringers are below 50% health, stop killing the Siege Engineer and walk into the Iron Star to send it rolling through all the weakened Warbringers, killing them in a single pass.
Defeat Garrosh
Once the achievement tracker turns white confirming the Iron Star kills are credited, defeat Garrosh to complete Strike!.
Tips
A Marksmanship Hunter using
MKII Gyroscopic Stabilizer and 
Roots of Shaladrassil can solo this on Heroic difficulty.Unequipping your weapon is a reliable way to deal chip damage to Warbringers without accidentally killing them before the Iron Star fires.