There are 3 bugs in uprising Trial and Error regarding the second boss. Two bugs exist in all 3 difficutlies: story, veteran and master.

1) The door to the room with the second boss is closed and cannot be clicked if you stand near it. You can only use the door from some distance.

2) One group of adds is not spawning. It should spawn when you approach the entrance to the next room to the right, but it does not.

These are certainly bugs, because they are present only the first time you approach the second boss. If you wipe and go to the boss again then both bugs are gone. It can be seen in the following video:

The third bug is related to the achievement and exists only in master mode: http://www.swtor.com/community/showthread.php?t=948220

Here is the video of the kill without activating any traps:

Also, you can see that in this kill video no adds are spawning at 2:50, which means we got bug number 2, which means that we didn't wipe on the second boss before and have 1-shot it. It answers the question of customer support that we may not get the achievement because we activated some traps on our previous tries to kill the boss.

Well watching the video, I would say you messed a bit too much with the mechanics. When we did the achievement we went into the room (proper 2d 1t 1h combination) and we didn't stay in the back of the room, but spread around the room. The door to next room wasn't open.

After the bosses disappeared we went directly into the room and faced the bosses. The tank was kitting like crazy, dps offhealed and we killed them in that same room. Maybe you guys should try to do it properly like its meant to be done. I am not saying it will work, but pulling such tricks might also mess with the achievo, it must be coded in a certain way and leaving the "area" might hinder it to pop.