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Gamerscore: 20
Achievement Description: Last for 45 mins in a Expansion Survival Map

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For this game type, you have to survive for a set amount of time on a map while monsters continually spawn. The monsters get more powerful the longer you survive and the game is over if either overlord dies. You can either play with someone over Xbox Live or split-screen with a second player or even just a second controller. If you play on the Silent Hall map, youll unlock all the Survivor achievements in a single 45 minutes game with almost no effort.

All you have to do is grab as many green minions as you can as soon as you spawn and both overlords run around to the corner to the left. Set up a flag point for your minions in the corner behind the barrels and tuck yourselves as far back into the corner as possible. Every five minutes, a few rats will spawn nearby and attack you, but your greens will make short work of them. Other that, with any luck, youll be out of the line of sight for every other monster on the map and you'll have all four Survivor achievements in 45 minutes (from The End). You do need a little bit of luck because occasionally a monster will randomly spot your greens as they kills the rats and theyll pummel you pretty quickly.