Killed Mahgda but...

It happened to me on Belial. It popped later the same day while I was messing around in town. It's a pretty common occurance, just keep playing. You might not even be playing Diablo when it pops. Some have said they noticed they finally go the achievement
but no notification ever popped.

I had the same thing happen with Mahgda, popped the next day. There are other glitch cheevos though. 100 treature trolls. I've killed at least 10 and it shows 1% progress

Well first thing first. Take your finger off the bloody right trigger. Just because you can dominate NPC's in single player by running around acting like a parkour fool doesn't mean you can do it in multiplayer. In revalations the basic kill is 100 points
you have a detection meter that starts at discreet (150 points on top of the basic kill) and when you get in line of sight of your target it works its way up to silent (250) then finally to incogneto (350) as long as your not being obvious and running. If
you run or do other high profile actions it will drain down to reckless (50). If your meter drains all they way down you'll start a chase thus losing any chanse of earning extra stealth points or if your playing deathmatch or steal the artifact just drain
it down to were you wont be able to earn those extra points. Stacking bonuses is also good. Hanging on a ledge or on some beams on the roof to get acrobatic. In a blended crowd or haystack (make sure your in it for a few seconds) to get a hidden kill. Beinging
next to your target to let the X fill up to earn focus. After you stack these you"ll start earning verity bonuses which will help boost up your score. Also check out this guy [View:http://www.youtube.com/user/TheMightyAstlan] to get more details on how to
improve in each game mode.

One of my favorite things about this game is that you can have a relatively uneventful round and steal the lead with a good, solid streak near the end. I play this game strictly as stealthily as possible, and haven't unlocked poison yet. In Brotherhood,
I was winning a lot of games once I got it down and used poison almost exclusively when the cooldown was up. I plan on doing the same thing in a few more levels. Just picked Revelations up the other day, and forgot how much I loved ACs MP until I got it
back.

On my second game, I just finished in 2nd place w/ 4 kills and 10 deaths.