Dungeon Siege III

This is how I won this Cheevo;

2-handed Lucas, paired with Reinhardt, lvl 19.

Start by smashing the teleports, thin the crowd out and keep yer distance.

Reinhardt uses some sweet magic against the robots, I waded in with the 2-handed charge and retreated.

I decided that I wanted this on my own terms, so I took out 2 of the 4 generators, and then eased off the robot slaying.

By playing it cautious, and in about 10 mins, I was able to keep the Gents respwans at a manageable level.

At the end of the fight I wailed on him with the RT+A attack, bested him in minutes.

Good luck!

PS: Achievement will NOT unlock during the fight, it unlocks during the cutscene after The Gent is defeated.

This achievement must be done by the host of the game session. The host's character has to kill all 50 automatons by himself/herself. The bots killed by other players will not count.
But the achievement will unlock for all the players of the session. :)

Achievement may glitch sometimes

Remember that this achievement unlocks when the fight is over, not during the fight. Sometimes it unlocks right when you see him running away, but sometimes it unlocks during the following dialogue.

However, if you are sure that you've killed 50+ automatons during the boss fight but for whatever reason your achievement didn't unlock, that's because it may have glitched. From what I've seen, it happens rarely when you unlock the level 20 achievement during the fight.

Anyway, if that happens to you, simply don't save after the dialogues following the fight.
Instead, clear your console cache and do the fight again and this time you should unlock the achievement properly.

To clear your cache:
X360:
-System Settings
-Storage
-Move the cursor on Hard Drive and press
-Clear System Cache

XOne:
-Press & Hold the console power button for 10s until it shuts down completely
or
-Power down the console, unplug the power cable and plug it back

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I tried to get this achievement 4 times (and for one of the try I killed robots for 20 minutes) but it wouldn't unlock until I cleared the system cache. I was playing on Xbox One but people have had this issue on 360 and apparently it can affect other achievements too.