Zombie Apocalypse
12 Achievements
200
8-10h
Anniversary of the dead
Complete the Final Day, in either Single or Multiplayer, and finish the game
45
How to unlock the Anniversary of the dead achievement in Zombie Apocalypse - Definitive Guide
-Use teddy bear's wisely! you only get one everyday or an extra for rescuing a survivor. All you do is press RB or LB to throw it then the zombies gather around it and it blows up. (Similar to the pipe bomb in Left 4 Dead)
-KEEP MOVING! You will need to stay on the move, especially as you progress farther into the game. If there's a load of zombie's around you try to use your chainsaw by holding RT. (I wouldn't Suggest using execution mode with LT)
-Pick up different guns, the M16 you start with is great and has infinite ammo but, it's not as effective as the Shotgun, SMGs, Hunting Rifle, Rocket Launcher, Etc. (Wouldn't suggest getting Molotov's unless there's tons of zombies around)
-Steer clear of the Birds/Bugs or whatever you want to call them that the queen makes, they take you out for good once they get you. Also be aware of Big Boys, Granny's Knives, and stay as far back as possible from the sheriffs.
-For the Boss battles aim for the center of him and watch out for lazers, birds/bugs, and his claw traps.
I hope these small tips helped and good luck!
The way I did the achievement was find a corner where weapons spawn and hold up there. If you have another player then have them stand near you chainsawing any zombies that get too close.
Other than that, just keep grinding away at the levels.
It does save after you complete a day, so you can at least take occasional breaks.
The final day is the 55th day. You just need to get to the 55th day, even if you do have to continue. If you don't continue, than your points just don't go towards the Leaderboards, but you are able to still get this trophy. (Thanks to SneakyWhite for this information)
NOTE: If you have a friend who has gotten to day 55, he can start the game on day 55 and invite you. After finishing that, you will get the trophy, even if you haven't done any of the other days.
For this achievement, you must finish the game. Which means you must complete Days 1-55, either solo or in multiplayer. I recommend going for this achievement in multiplayer, as it will cut down on the time it would take to complete all 55 days and it won't make the later levels feel so overwhelming.
Alternate Method: You can have a friend on Xbox Live invite you to a match and start the game on Day 55, or use the Achievement Trading Thread found here. Complete Day 55 and the achievement is yours.