The keyword in this achievement is "ALL" You need to destroy all of the coolant tanks. The coolant tanks are big, blueish canister looking things (they are hard to miss).
Now i had a lot of trouble with this one because the video in the other solution only showed the 3 coolant tanks in the secret room. But those are not the only 3. There are a total of 15 coolant tanks.
The first 8 are in the room where you first encounter the terror troopers (the enemies that move around really fast). There are 2 in each corner of the room.
The next 4 are in the next room - they are pretty easy to spot, just don't miss the one on your right when you enter the room.
And the last 3 (the secret room tanks) are in the next room. You will enter the room and you will see a hall leading to a power key and a door and you will see a hall on your right leading to another door. Take the key in front of you and bring it to the door to the hall on you right. The final 3 tanks are in there - destroy them and your achievement should pop.
NOTE: The achievement takes a few seconds to pop and if you hit the scene where Boba Fett is taking Juno away, you have gone too far (you took the wrong door)
Hope this guide helps. If I missed anything, let me know.